@misc{indiciae118a47b024bd,
  title = {Ulcerative colitis: "puzzles within puzzles".},
  author = {J B Kirsner},
  year = {1970},
  doi = {10.1056/nejm197003122821114},
  url = {https://pubmed.ncbi.nlm.nih.gov/5413870/},
  note = {Source identifier: 5413870}
}