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PubMed2004

Colon cancer controls versus population controls in case-control studies of occupational risk factors.

BACKGROUND: Since updated population registers do not exist in many countries it is often difficult to sample valid population controls from the study base to a case-control study. Use of patient controls is an alternative option if the exposure experience under study for these patients are interchangeable with the experience for population controls. Patient controls may even be preferable from population controls under certain conditions. In this study we examine if colon cancer patients can serve as surrogates for proper population controls in case-control studies of occupational risk factors. METHODS: The study was conducted from 1995 to 1997. Incident colon cancer controls (N = 428) aged 35-69 years with a histological verified diagnosis and population controls (N = 583) were selected. Altogether 254 (59%) of the colon cancer controls and 320 (55%) of the population controls were interviewed about occupational, medical and life style conditions. RESULTS: No statistical significant difference for educational level, medical history or smoking status was seen between the two control groups. There was evidence of a higher alcohol intake, less frequent work as a farmer and less exposure to pesticides among colon cancer controls. CONCLUSIONS: Use of colon cancer controls may provide valid exposure estimates in studies of many occupational risk factors for cancer, but not for studies on exposure related to farming.

Adult↗
PubMed2006

Health-related quality of life in patients waiting for major joint replacement. A comparison between patients and population controls.

BACKGROUND: Several quality-of-life studies in patients awaiting major joint replacement have focused on the outcomes of surgery. Interest in examining patients on the elective waiting list has increased since the beginning of 2000. We assessed health-related quality of life (HRQoL) in patients waiting for total hip (THR) or knee (TKR) replacement in three Finnish hospitals, and compared patients' HRQoL with that of population controls. METHODS: A total of 133 patients awaiting major joint replacement due to osteoarthritis (OA) of the hip or knee joint were prospectively followed from the time the patient was placed on the waiting list to hospital admission. A sample of controls matched by age, gender, housing and home municipality was drawn from the computerised population register. HRQoL was measured by the generic 15D instrument. Differences between patients and the population controls were tested by the independent samples t-test and between the measurement points by the paired samples t-test. A linear regression model was used to explain the variance in the 15D score at admission. RESULTS: At baseline, 15D scores were significantly different between patients and the population controls. Compared with the population controls, patients were worse off on the dimensions of moving (P < 0.001), sleeping (P < 0.001), sexual activity (P < 0.001), vitality (P < 0.001), usual activities (P < 0.001) and discomfort and symptoms (P < 0.001). Further, psychological factors--depression (P < 0.001) and distress (P = 0.004)--were worse among patients than population controls. The patients showed statistically significantly improved average scores at admission on the dimensions of moving (P = 0.026), sleeping (P = 0.004) and discomfort and symptoms (P = 0.041), but not in the overall 15D score compared with the baseline. In patients, 15D score at baseline (P < 0.001) and body mass index (BMI) (P = 0.020) had an independent effect on patients' 15D score at hospital admission. CONCLUSION: Although patients' HRQoL did not deteriorate while waiting, a consistently worse HRQoL was observed in patients waiting for major joint replacement compared with population controls.

Adult↗
PubMed2004

Fatal accidents and suicide among reindeer-herding Sami in Sweden.

OBJECTIVE: Over the last decades, reindeer-herding management has experienced dramatic changes, e.g. increased motorization and socio-economic pressure. The aim of the present study was to investigate whether these changes have increased the risk of fatal, work-related accidents and suicide between 1961 and 2000. STUDY DESIGN AND METHODS: A cohort containing 7,482 members of reindeer-herding Sami families was extracted from national population registers. Information on fatal accidents and suicide was obtained from the Swedish Causes of Death Register, and compared to the expected number of deaths in a demographically matched control population of non-Sami. RESULTS: The male reindeer herding Sami showed a significantly increased risk of dying from accidents such as vehicle accidents and poisoning. No significant increased risk of suicide was observed. A comparison between the periods of 1961-1980 and 1981-2000 showed non-significant differences in risk, although a trend towards increased risks was observed for most types of external causes of death except suicide. CONCLUSIONS: It is suggested that the increased socio-economic pressure and the extensive use of terrain vehicles have increased the risk for fatal accidents among Swedish reindeer herders, and that commercial reindeer management is one of the most dangerous occupations in Sweden.

Accidents, Occupational↗
PubMed1999

Health status in systemic lupus erythematosus compared to rheumatoid arthritis and healthy controls.

OBJECTIVE: To examine health status in systemic lupus erythematosus (SLE), using both generic and arthritis-specific instruments, and compare the health status in patients with SLE to matched patients with rheumatoid arthritis (RA) and matched healthy controls. As well, to study possible correlations between health status measures and demographic and disease variables in the patients with SLE. METHODS: Patients were recruited from the Oslo county registers of patients with SLE and RA, and the healthy controls from the county population register. Measures of health status (Medical Outcome Survey SF-36, joint pain and fatigue on visual analog scale, Modified Health Assessment Questionnaire) were obtained from 82 SLE and 82 RA patients matched for age, sex, and disease duration, and from 74 age and sex matched healthy controls. Disease activity and organ damage were assessed in the patients with SLE. RESULTS: Patients with SLE were significantly more affected in all dimensions of health status compared to controls, except in the SF-36 category role-emotional. Further, patients with SLE were significantly less affected than patients with RA with regard to physical function and joint pain, but scores were similar in all other dimensions of health status. Scores of health status correlated more strongly to the damage index than to disease activity, indicating that health status measures capture some of the same concept as the damage index, namely the consequence of the disease over time. CONCLUSION: Our study showed that patients with SLE and RA have a multidimensional involvement of health status compared to healthy controls. The findings call for a biopsychosocial approach in the management of SLE.

Adult↗
PubMed1999

Trends in overweight and obesity among 18-year-old males in Sweden between 1971 and 1995.

The aims of the study are to analyse Swedish trends in overweight and obesity-as measured by body mass index (BMI)-between 1971 and 1995, and to examine socioeconomic and geographic differences between groups of individuals on the basis of information on 18-y-old military conscripts. The study population comprises all males born in 1953, 1958, 1963, 1968, and between 1973 and 1977, reported to be living in Sweden at 17 y of age according to nationwide population registers (RTPs). Utilizing the unique personal ID number, sociodemographic data in the RTPs and in Population and Housing censuses were linked to data on BMI in the national Military Service Conscription Registry for the years 1971 to 1995. These data were obtained from compulsory medical examinations held at military induction at 18 y of age. BMI data were available for 448 732 (89%) of a total of 503 689 subjects. Mean BMI increased by 6.6% over the study period-from 21.1 kg/m2 in 1971 to 22.4 kg/m2 in 1995. Unadjusted trend analyses showed a 2.4 times increase in the prevalence of overweight among 18-y-old males over the period-from 6.9% in 1971 to 16.3% in 1995. Over the same years, the prevalence of obesity increased 3.5 times-from 0.9% to 3.2%. After adjustment for muscle power, demographic factors, and living area, the prevalence of overweight was found to have increased 1.4 times, and obesity 1.7 times between 1971 and 1993. The prevalence of overweight was considerably higher among 18-y-old males from low-educated families than among those from high-educated families in both 1971 and 1995. The prevalence of overweight was also found to be higher in both 1971 and 1995 among young men from rural and/or sparsely populated areas than among those living in Sweden's largest cities. Mean BMI, and the prevalence of overweight and obesity have increased among 18-y-old males in Sweden over the last 24 y. The increased risk of overweight among young men from low-educated families and those from rural and/or sparsely populated areas detected in 1971 was still evident in 1995.

Adolescent↗
PubMed2003

External validity in a population-based national prospective study--the Norwegian Women and Cancer Study (NOWAC).

OBJECTIVE: 'The Norwegian Women and Cancer Study' (NOWAC) was created as a national population-based cohort study by taking advantage of the existing population registers in Norway. Thus, the women in the NOWAC study should be representative for the entire female population in the corresponding age-groups. The aim of this paper was to study the external validity of the cohort as a necessary premise for the estimation of population attributable risk. METHODS: Between 1991 and 1997 women were sampled randomly from the national Central person registry in Norway. A total of 179,388 women were invited, of whom 102,443 can be included in the forthcoming follow-up analysis. The response-rates were around 60% in the age-groups 30-34 years till 55-59 years, while 44.7% responded among those aged 65-70 years. Information was collected by postal questionnaires. Follow-up information was based on linkage to national end-point registers with use of the unique national identification number given all Norwegians. RESULTS: Validation of the information on parity and education by linkage to national registers showed only minor differences for these factors between the responders and the total sample of women. A postal survey among non-responders indicated that the most important reasons for not returning the questionnaire were lack of time and concern about privacy. The results showed no differences in life-style factors between the original responders and the non-responders. No significant differences were found between the observed incidence rates for all cancer sites or cancer of the breast compared with national figures for the year 1999. CONCLUSION: The analysis revealed no major source of selection bias that could seriously invalidate the estimation of population attributable risk.

Adult↗
PubMed1996

An earlier fracture as a risk factor for new fracture and its association with smoking and menopausal age in women.

OBJECTIVES: The purpose of this study was to investigate whether a previous fracture is a risk factor for fracture later in life and its association with tobacco smoking, menopausal age and the use of oral contraceptives. This is an epidemiological population study based on a questionnaire. A sample of 10000 women from seven birth cohorts between 1900-1940 was obtained at random from the population register. The overall response rate was 74.6%. The responders (n = 7459) represented 53% of the total population. METHODS: The women from all these birth cohorts were questioned regarding a possible history of fractures and the year in which they were sustained. The questionnaire also included questions about menopausal age, use of oral contraceptives, previous gynaecological operations and possible oestrogen medication. The women from the 1900-1920 birth cohorts were questioned in detail about urogenital disorders, while tobacco smoking data were recorded only for the 1930 and 1940 birth cohorts. RESULTS: The relative risk of sustaining a further fracture was significantly related to fracture premenopausally before 40 years of age and later fracture postmenopausally after 60 years of age (1.29; 0.97-1.70) compared to controls (0.78; 0.59-1.03)(P = 0.03). Both an early menopause and tobacco smoking were associated significantly with repeated fractures, while use of oral contraceptives had a protective effect against repeated fractures in the 1940 birth cohort. Logistic multiple regression showed that a fracture was a significant independent risk factor for further fracture in both cohorts 1900-1920 (P < 0.01) and 1930-1940 (P < 0.05). CONCLUSIONS: This study suggests poorer protective resources against new fractures among women with previous fractures, and that lack of oestrogen menopausally can partly explain the enhanced risk of fracture, not only during the menopause but also later in life when a hip fracture may have immense consequences. The results should draw our attention to emphasise the need for active treatment of patients with established osteoporosis because of the increased risk of new fractures later in life.

Age Factors↗
PubMed1994

Effects of preconceptional irradiation on mortality and cancer incidence in the offspring of patients given injections of Thorotrast.

BACKGROUND: Findings from a British case-control study suggest that a preconceptional paternal external radiation dose of more than 100 mSv (10 rem) is significantly related to risk for leukemia and non-Hodgkin's lymphoma in offspring. The suggestion, however, has not been supported by experimental or other epidemiologic studies. PURPOSE: The purpose of this study was to investigate if preconceptional irradiation of males and females from internally deposited radionuclides affects mortality and risk of developing cancer in their offspring. METHODS: The offspring of 260 females (n = 143) and 320 males (n = 226) who lived longer than 1 year after receiving Thorotrast (a compound no longer in use) for cerebral arteriography were studied for mortality rate and the risk for developing cancer. Thorotrast was used as a contrast medium containing a 20% colloidal solution of thorium dioxide-Th 232, an alpha particle-emitting radionuclide, which is retained lifelong in nearly all organs. The offspring of the exposed patients were identified by manual linkage with the municipal population registers and followed-up for vital status by computerized linkage with the Danish National Central Population Registry and for incidence of cancer by computerized linkage with the Danish National Cancer Registry. The standardized mortality/morbidity ratios (SMRs) for death and for site-specific incidence of cancer in the offspring were calculated as ratios of the observed rates in the study population to the expected rates in the general population. RESULTS: After a median follow-up of 40 years, four cases of cancer (breast [one], uterine cervix [one], melanoma of skin [one], and retinoblastoma [one]) versus 2.9 cases expected, developed among 143 children born to mothers who received injections of Thorotrast (SMR = 1.4; 95% confidence interval [CI] = 0.4-3.5), while six cases of cancer (one case each of cancer of lung, testis, thyroid, and Hodgkin's lymphoma and two cases of melanoma of skin), versus 4.5 expected, occurred among 226 children of exposed fathers (SMR = 1.3; 95% CI = 0.5-2.9). No case of leukemia or non-Hodgkin's lymphoma occurred in any of the offspring studied. Mortality was lower than expected both for children of exposed mothers (SMR = 0.7; 95% CI = 0.3-1.5) and of exposed fathers (SMR = 0.5; 95% CI = 0.2-1.0). CONCLUSIONS: This study does not support the previously proposed association between parental exposure to radiation and the risk of childhood leukemia and lymphoma. Furthermore, since mortality from all causes was not increased in any offspring, our results do not support the belief that preconceptional parental low-dose exposure to alpha radiation increases the incidence of cancer or mortality in the offspring.

Adolescent↗
PubMed1996

General practice on a new housing estate. 1956.

An analysis has been carried out of the records kept for the year 1953 by six doctors practising on a new housing estate near London. The population of the estate is described in terms of age, sex, and social class. 76 per cent. of the registered patients consulted a doctor at some time during the year, the consultation rate per person being 4.1 based on the average registered population; females had more consultations than males; 80 per cent. of all consultations were made by people under the age of 45. One-sixth of the patients accounted for about half of the consultations, and 30 per cent. of the consultations were made by the 7 per cent. of registered patients who consulted twelve or more times in the year. The consultation rates showed a slight, but statistically significant, social gradient, with more consultations among patients in the lower social classes. The illness rate was 26 per person, and was higher among males in infancy and old age, and among females between the ages of 5 and 64. A method of estimating the duration of sickness in terms of the period under medical care was employed. This showed that 70 per cent. of all illnesses were dealt with in single consultations, and that only 3 per cent. of illnesses were under care for more than 90 days. Over half of the practice population were under care for less than 5 days, and only 8 per cent. for more than 90 days. The proportion of patients having more than 30 days sickness generally increased with age, but there was a slight fall among the women aged 65 and over. Certificates were issued at the rate of about one for every five consultations, two-thirds of these being necessitated by the requirements of the National Insurance regulations. Prescriptions were issued at the rate of about one per consultation, the prescription rate being 41 per person. Only 5 per cent. of the practice population consulted the doctor but did not obtain a prescription. About 30 per cent. of the patients who consulted a doctor were referred outside the practices, 80 per cent. of all referrals being to hospitals, either as inpatients or as out-patients. The person-hospital referral rate was 20 per 100, and there were 31 referrals for every 100 registered patients. Males over 65 had the highest rates for consultations, illnesses, prescriptions, and referrals. The reason for this is discussed. The value of record-keeping by general practitioners is stressed, together with the need for a generally accepted method of expressing rates in studies of this kind.

Family Practice↗
PubMed2006

Swedish registers to examine drug safety and clinical issues in RA.

Data from several different monitoring systems are examined. The potential for registers based on data obtained from clinical practice, and linkage of such data to national health and population registers, is discussed. The approach described is a possible prototype for long term surveillance systems needed for the safe introduction of new treatments.

Antirheumatic Agents↗
PubMed2006

Twins and their health cost: consequences of multiple births on parental health and mortality in Denmark and England and Wales.

The rapid increase in twinning rates in developed countries has increased interest in the question as to whether twin mothers have higher mortality and more health problems than mothers of singletons. Here we use a national survey, the Office for National Statistics Longitudinal Study of England & Wales, and a linkage between the Danish Twin Registry and the Danish population register to examine mortality patterns after age 45 (50 for fathers) for twin parents and the whole population born from 1911 to 1950. For England and Wales, presence of limiting long-term illnesses and self-rated health status was also investigated. Overall similar health and mortality was found for twin parents and the whole population although both life table methods and survival analysis suggested a slight excess mortality among older cohorts of twin mothers in England and Wales.

Adolescent↗
PubMed1996

Incidence and risk factors of cancer among men and women in Norwegian agriculture.

OBJECTIVES: The objective of the study was to examine cancer incidence and identify risk factors among subjects born in 1925-1971 and engaged in agricultural activities in Norway. METHODS: A cohort was established through linkage between agricultural censuses in 1969-1989 and the Central Population Register, which identifies farm holders and their spouses. Available census information on the activity of the farm provided the exposure indicators. Incident cancer in 1969-1991 was identified in the Cancer Register. In an analysis for standardized incidence ratios (SIR), the cohort was compared with the total rural population of Norway. Associations with exposure indicators were investigated in a Poisson regression analysis. RESULTS: In the follow-up of 136,463 men for 1.5 million person-years and 109,641 women for 0.6 million person-years, 3333 and 2145 cancer cases were identified, respectively. The subset defined as farmers had an SIR of 77 [95% confidence interval (95% CI) 73-81] for the men and 92 (95% CI 85-99) for the women, with particularly low SIR values for lung cancer and other sites linked to life-style. The several positive associations found confirmed the a priori hypothesis of an association between dairy farming and acute leukemia among men [rate ratio 1.76, 95% CI 1.02-3.05]. Multiple myeloma was associated with pesticide indicators for both genders, mainly for subjects cultivating potatoes. CONCLUSIONS: The results support the hypothesis of a relationship between acute leukemia and animal contact and between multiple myeloma and pesticides in potato cultivation. Other exposure associations, especially for cancer among women, warrant further investigation.

Adult↗
PubMed1992

Mortality in alcohol-related diseases in Sweden during 1971-80 in relation to occupation, marital status and citizenship in 1970.

A new Swedish population register, created by linking Census data to the Cause of Death Registry and covering over 99% of the population, has been used to study the relationship between occupational category, marital status and citizenship in 1970 and mortality in closely alcohol-related diseases during 1971-1980 for the ages 25-64 years. Age-standardized rate ratios (SRR) have been computed for mortality in alcoholism, alcohol intoxication and alcohol psychosis ("AAA") and in liver cirrhosis. SRR-values for both diagnose categories and both sexes were higher than average among not gainfully employed (SRR = 3.71 among males and SRR = 1.96 among females in 1976-80 for "AAA"), among employees in the service sector, engine-drivers and unskilled workers and increased in liver cirrhosis among artists and authors. Among females there were smaller variations in mortality for occupational groups than among males. The SRR-values showed a tendency to be higher in 1976-80 than in 1971-75, probably due to health-related selection to some extent. The alcohol-related mortality was also increased among divorced, widows (SRR = 1.37 for "AAA" and 2.81 for liver cirrhosis in 1976-80) and widowers and among never married males. SRR was much higher among Finnish citizens in Sweden (SRR for "AAA" = 3.85 among males and 2.35 among females in 1976-80) than among males and females living in Finland (SRR for "AAA" = 1.13 among males and 0.36 among females) and also higher than among immigrants from other countries, summed (SRR for "AAA" = 0.62 among males and 0.64 among females).(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed2001

Fragmentation of the Québec population genetic pool (Canada): evidence from the genetic contribution of founders per region in the 17th and 18th centuries.

The 6 million French-Canadians of Québec derive from a relatively small number of founders. Consequently, some hereditary diseases, which may or may not present a worldwide distribution, have been detected in high frequency in this population. Several studies, however, indicate a nonuniform distribution of these diseases through the population, suggesting that the French-Canadian founder effect has been geographically stratified. Here we explore this stratification by using a demographic database, the Population Register of Early Québec, that contains almost all birth, marriage, and death certificates (>712,000) recorded in parish registers between 1608-1800. In this database, every genealogical link has been traced back to the founders of the population, so that we can compute the genetic contribution of founder per region, and then account for the early events that have shaped the distribution of diseases. Ten regions, comprising varying numbers of parishes, have been selected. We first describe each region in terms of homogeneity and concentration of its gene pool. For this purpose, a new concept is introduced, the founders' uniform contribution number (FUN), i.e., the number of founders a population would have if all its founders had an equal contribution. Second, we estimate genetic similarity between regions on the basis of differential genetic contribution. To classify the regions, we use principal component and cluster analysis. Our results show a tripartite clustering of the population, and invite us to reconsider the results obtained from biomolecular and clinical studies, which show a bipartite clustering.

Adult↗
PubMed2006

[Current state of research on migration in Austria. A brief review].

Although Austria has been the aim of immigration for many years, research in the field of migration and integration is not yet established. Of the Austrian population, 9.6% have foreign citizenship and the proportion of the migrant population is highest in Vienna, where it is 18.0%. In 2002 a population register system was implemented in Austria which allows a more detailed description of migration processes and a differentiation of population by citizenship and country of birth. In social science and public health research as well as in official statistics and surveys the item of migration is not given sufficient consideration. On a political level, especially in Vienna, a comprehensive strategy of integration and diversity is being increasingly regarded as essential, and federal health policy has recently also focused on the health of migrants. In the future migration will hopefully be re-evaluated as the need for a humanitarian approach is recognized but also the benefits from migration in cultural, economic and demographic affairs are better appreciated and research is allowed to play an appropriate role in this process.

Acculturation↗
PubMed2001

Grand multiparity and the risk of breast cancer: population-based study in Finland.

OBJECTIVES: The significance of reproductive factors on breast cancer risk has so far been characterized in populations with 5-paras as the highest category of parity. We extended these studies to a nationwide cohort of women with at least five births (grand multiparas = GM) by assessing the significance of parity, age at first birth, and average birth interval to the risk of breast cancer. METHODS: The study cohort obtained from the Population Register of Finland comprised 86,978 GM-women; the incidence of cancer cases was obtained from the populated-based Finnish Cancer Registry. During a follow-up of about 2 million person-years, 1508 breast cancers were obtained. Standardized incidence ratios (SIRs) were calculated by dividing the number of observed cases by the number expected on the basis of national rates. RESULTS: In the GM cohort the incidence of breast cancer was low (SIR 0.55, 95% confidence interval 0.52-0.58). The relative risk decreased significantly from 5-paras (SIR 0.60, adjusted for the other study variables) to 8-paras (SIR 0.40). The increase in the age at first birth from less than 20 years to 30+ years nearly doubled the risk (SIR from 0.40 to 0.73). Parity was a significant risk determinant only in ductal cancer, while shortening the birth interval was protective only in lobular cancer. The incidence of advanced breast cancer among GM-women exceeded the population rate in premenopausal women and in women with first birth at the age of 30 years or more. CONCLUSIONS: Our study demonstrated that young age at first birth and increasing number of births were independent and powerful protective factors from the fifth child onwards, while birth interval was weak in this respect. The tumor morphology and the clinical advancement of malignancy modified the dependence of breast cancer risk on reproductive variables.

Aged↗
PubMed1992

Cancer incidence among Danish Thorotrast-exposed patients.

BACKGROUND: Studies of groups of patients given injections of the alpha-emitting x-ray contrast medium Thorotrast may provide information on human alpha-ray carcinogenesis. PURPOSE: We re-established a formerly identified cohort of neurological patients receiving injections of Thorotrast for cerebral arteriography and assessed their incidence of cancer. METHODS: Using the national population register, the Danish Cancer Registry, and other registers, we determined the incidence of cancer among Thorotrast-injected patients. Incidence ratios were standardized to the general population and computed for different cancer sites. RESULTS: The cumulative risk for cancer at all sites (excluding brain tumors where the standardized incidence ratio [SIR] was 28) reached 86% 50 years after Thorotrast injection. SIR was greatly elevated at all sites except the brain and CNS (3.3, 95% confidence interval = 3.0-3.7), mainly because of liver cancers (SIR = 126) as well as leukemia (SIR = 10) for which a relationship was found between the time since injection and the estimated dose (but not the age at injection). Other sites with significantly increased risks of cancer included the gallbladder and extrahepatic bile ducts (SIR = 14), peritoneum (SIR = 8.6), sites of multiple myeloma (SIR = 4.6), metastatic sites (SIR = 12), and unspecified sites (SIR = 11). Cancers of the lung and breast also occurred in significant excess, but no relationship between SIR and volume of injected Thorotrast or time since injection was observed. Cancer risk was increased at most other sites, although this increase was not statistically significant. CONCLUSION: Alpha radiation may account for the increased risk of tumors of the liver, gallbladder, and peritoneum as well as leukemia and multiple myeloma, whereas confounding factors most probably contribute to the increased risks at other sites.

Adult↗
PubMed1994

[Non-Dutch nationals in the Netherlands on January 1, 1994].

"On 1 January 1994, 780 thousand non-Dutch nationals lived in the Netherlands, i.e. 5.1% of the total population. These figures only relate to people in Dutch municipal population registers who do not possess the Dutch nationality, thus excluding Dutch citizens born elsewhere." Data are provided on nationality, population growth, region of residence, immigration, motivation for migration, asylum seekers, marriage patterns, and non-Dutch nationals obtaining Dutch nationality. (SUMMARY IN ENG)

Behavior↗