00563nas a2200205   4500000000100000000000100001008004100002100001400043700001400057700001300071700001300084700001900097700001400116700001400130700001400144245016800158300001000326490000700336022001400343       2015                            d1 aV. Chhaya1 aS. Saxena1 aE. Cecil1 aS. Chatu1 aV. Subramanian1 aV. Curcin1 aA. Majeed1 aR. Pollok00aThe impact of timing and duration of thiopurine treatment on colectomy in ulcerative colitis: a national population-based study of incident cases between 1989-2009  a87-980 v41  a0269-2813