@misc{indiciae0b22e9edf451,
  title = {Upper gastrointestinal endoscopy without prior sedation.},
  author = {S Sahm and H Dancygier},
  doi = {10.1016/s0016-5107(89)72924-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/2599303/},
  note = {Source identifier: 2599303}
}