@misc{indiciaee5523b0fe278,
  title = {Transduodenal endoscopy.},
  author = {S F O'Beirn},
  year = {1969},
  doi = {10.1136/gut.10.4.323},
  url = {https://pubmed.ncbi.nlm.nih.gov/5782316/},
  note = {Source identifier: 5782316}
}