@misc{indiciae2c456642233b,
  title = {Letter: Upper-gastrointestinal endoscopy.},
  author = {D G Colin-Jones},
  year = {1975},
  doi = {10.1016/s0140-6736(75)90346-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/53539/},
  note = {Source identifier: 53539}
}