@misc{indiciae5b5d163c16dc,
  title = {Peptic ulcer disease: introduction.},
  author = {A J Ryan},
  year = {1978},
  doi = {10.1080/00325481.1978.11714806},
  url = {https://pubmed.ncbi.nlm.nih.gov/634870/},
  note = {Source identifier: 634870}
}