@misc{indiciaecf165212403c,
  title = {Operative colonoscopy.},
  author = {H J Espiner and P R Salmon and R H Teague and A E Read},
  year = {1973},
  doi = {10.1136/bmj.1.5851.453},
  url = {https://pubmed.ncbi.nlm.nih.gov/4689835/},
  note = {Source identifier: 4689835}
}