@misc{indiciaef901c58ffd5b,
  title = {Ulcerative esophagitis and ulcerative colitis.},
  author = {K B Knudsen and M Sparberg},
  year = {1967},
  doi = {10.1001/jama.1967.03130020086028},
  url = {https://pubmed.ncbi.nlm.nih.gov/6072961/},
  note = {Source identifier: 6072961}
}