@misc{indiciae15ab3588c6d5,
  title = {Measuring passive smoking: methods, problems, and perspectives.},
  author = {L C Johnson and H W Letzel},
  year = {1984},
  doi = {10.1016/s0091-7435(84)80020-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/6536945/},
  note = {Source identifier: 6536945}
}