@misc{indiciaef023ab5af346,
  title = {Variations in general practitioners' response to postal questionnaires.},
  author = {A Cartwright and A W Ward},
  year = {1968},
  doi = {10.1136/jech.22.4.199},
  url = {https://pubmed.ncbi.nlm.nih.gov/5727145/},
  note = {Source identifier: 5727145}
}