@misc{indiciaea30424d47480,
  title = {Problems encountered by early endoscopists.},
  author = {P Nicholson},
  year = {1982},
  doi = {10.1016/0090-4295(82)90065-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/7036492/},
  note = {Source identifier: 7036492}
}