@misc{indiciaee835233a62a8,
  title = {Gastroduodenoscopy using an irrigating cystoscope.},
  author = {R M Kirk},
  year = {1973},
  doi = {10.1002/bjs.1800600411},
  url = {https://pubmed.ncbi.nlm.nih.gov/4700229/},
  note = {Source identifier: 4700229}
}