@misc{indiciae20aefb4053e5,
  title = {[Gastrointestinal endoscopy: attempt at evaluation].},
  author = {M Classen and P Frühmorgen and W Rösch},
  year = {1973},
  url = {https://pubmed.ncbi.nlm.nih.gov/4270469/},
  note = {Source identifier: 4270469}
}