@misc{indiciae75bb085a4e4e,
  title = {[Gastrointestinal bleeding (introduction)].},
  author = {H Koyama and J Sasaki and H Niwa},
  year = {1998},
  url = {https://pubmed.ncbi.nlm.nih.gov/9780712/},
  note = {Source identifier: 9780712}
}