@misc{indiciaed29a96691607,
  title = {Validating a pulmonary-function screening survey.},
  author = {J W Ledwith},
  year = {1972},
  doi = {10.1080/00039896.1972.10666057},
  url = {https://pubmed.ncbi.nlm.nih.gov/5007654/},
  note = {Source identifier: 5007654}
}