https://radiopaedia.org/play/19075/entry/324802/case/6200/studies/7640#questions
https://statmed.org/knowledge/ulcerative_colitis
https://radiopaedia.org/cases/apple-core-sign?lang=us
https://repository.usu.ac.id/bitstream/handle/123456789/3381/08E00077.pdf?sequence=2&isAllowed=y