@misc{indiciaee43282563fec,
  title = {Three reasons for ulcerative colitis.},
  author = {G A MacGregor},
  year = {1973},
  doi = {10.1016/s0140-6736(73)90622-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/4121240/},
  note = {Source identifier: 4121240}
}