@misc{indiciae5227d1729acd,
  title = {Factors affecting response to postal questionnaires.},
  author = {S Kaplan and P Cole},
  year = {1970},
  doi = {10.1136/jech.24.4.245},
  url = {https://pubmed.ncbi.nlm.nih.gov/5496532/},
  note = {Source identifier: 5496532}
}