@misc{indiciaee19639d8ed17,
  title = {Pre-screening questionnaires, screening and post-screening programmes.},
  author = {C H Walker},
  year = {1977},
  doi = {10.1111/j.1469-8749.1977.tb07976.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/858451/},
  note = {Source identifier: 858451}
}