@misc{indiciaed1e816d370a3,
  title = {Ulcerative colitis. Etiologic unity or polyetiologic syndrome?},
  author = {P Arend and G A Martini},
  year = {1970},
  url = {https://pubmed.ncbi.nlm.nih.gov/5483293/},
  note = {Source identifier: 5483293}
}