References
Pathologic Features of Ulcerative Colitis in Patients With Primary Sclerosing Cholangitis : A Case-control Study. Joo M, Abreu-E-Lima P, Farraye F, Smith T, Swaroop P, Gardner L, Lauwers GY, Odze RD. Am J Surg Pathol. 2009 Mar 17. PMID : 19295408