@misc{indiciaea8a85afd31cc,
  title = {Endoscopy and upper gastrointestinal tract bleeding.},
  author = {J D Levinson and M B Kerner},
  year = {1981},
  url = {https://pubmed.ncbi.nlm.nih.gov/6983587/},
  note = {Source identifier: 6983587}
}