@misc{indiciae508f1f3dcbea,
  title = {Do we need objective measures to validate self-reported smoking?},
  author = {R Williams and P Gillies},
  year = {1984},
  doi = {10.1016/s0033-3506(84)80006-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/6505137/},
  note = {Source identifier: 6505137}
}