Papadimitriou JC, Drachenberg CB, Klassen DK, Gaber L, Racusen LC, Voska L, Cangro CB, Ramos E, Wali R, Weir MR, Bartlett ST. Histological grading of chronic pancreas allograft rejection/graft sclerosis. Am J Transplant. 2003 May; 3(5):599-605.