@misc{indiciae3a467df5c714,
  title = {Training in endoscopic procedures.},
  author = {E B Keeffe and J Van Dam},
  year = {1997},
  doi = {10.1097/00005176-199703000-00027},
  url = {https://pubmed.ncbi.nlm.nih.gov/9138191/},
  note = {Source identifier: 9138191}
}