@misc{indiciaea55180a41d7c,
  title = {Prone or supine?},
  author = {R J Bray and T A Piggot and C A Reid},
  year = {1989},
  doi = {10.1136/adc.64.3.429-b},
  url = {https://pubmed.ncbi.nlm.nih.gov/2705815/},
  note = {Source identifier: 2705815}
}