@misc{indiciaeffec0697c857,
  title = {Confounding by variable smoking habits in different occupational groups.},
  author = {S Asp},
  year = {1984},
  doi = {10.5271/sjweh.2321},
  url = {https://pubmed.ncbi.nlm.nih.gov/6523098/},
  note = {Source identifier: 6523098}
}