@misc{indiciaea0752a6f0415,
  title = {Screening for chronic obstructive pulmonary disease.},
  author = {O J Balchum},
  year = {1968},
  doi = {10.1080/00039896.1968.10665150},
  url = {https://pubmed.ncbi.nlm.nih.gov/5654544/},
  note = {Source identifier: 5654544}
}