TY  - RPRT
TI  - Validating a pulmonary-function screening survey.
AU  - J W Ledwith
PY  - 1972
DO  - 10.1080/00039896.1972.10666057
UR  - https://pubmed.ncbi.nlm.nih.gov/5007654/
ID  - 5007654
ER  -