Observer variation of diagnoses based on simple biopsy criteria differentiating among Crohn's disease, ulcerative colitis, and other forms of colitis.
J Gastroenterol Hepatol. 2001 Dec;16(12):1368-72. doi: 10.1046/j.1440-1746.2001.02638.x.
J Gastroenterol Hepatol. 2001.
PMID: 11851834