@misc{indiciaeb31facd387cd,
  title = {The Chief Scientist reports.... Problems in mounting and maintaining longitudinal studies--examples from dental health services research.},
  author = {J A Davies and H E Fyffe and N B Pitts},
  year = {1992},
  url = {https://pubmed.ncbi.nlm.nih.gov/1517092/},
  note = {Source identifier: 1517092}
}