@misc{indiciae2399f219c064,
  title = {[Duodenoscopy. Technic and results].},
  author = {H Koch and P Frühmorgen and M Classen},
  year = {1973},
  url = {https://pubmed.ncbi.nlm.nih.gov/4719629/},
  note = {Source identifier: 4719629}
}