@misc{indiciaefa00802c9f8f,
  title = {Anal bleeding survey.},
  author = {S M Farquharson and R J Heald},
  year = {1994},
  doi = {10.1016/s0140-6736(94)92241-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/7915796/},
  note = {Source identifier: 7915796}
}