@misc{indiciae1bb2cb3a9cf8,
  title = {Gastrointestinal endoscopy.},
  author = {G Berci and L Morgenstern and J Panish and J M Shore},
  year = {1973},
  url = {https://pubmed.ncbi.nlm.nih.gov/4276681/},
  note = {Source identifier: 4276681}
}