@misc{indiciae931ecfae6174,
  title = {A pitfall in sampling medical visits.},
  author = {D S Shepard and R Neutra},
  year = {1977},
  doi = {10.2105/ajph.67.8.743},
  url = {https://pubmed.ncbi.nlm.nih.gov/888991/},
  note = {Source identifier: 888991}
}