00527nas a2200193   4500000000100000000000100001008004100002100001400043700001400057700001300071700001900084700001400103700001400117700001400131245015600145300001100301490000700312022001400319       2015                            d1 aV. Chhaya1 aS. Saxena1 aE. Cecil1 aV. Subramanian1 aV. Curcin1 aA. Majeed1 aR. Pollok00aImpact of timing and duration of thiopurine treatment on first perianal surgery in Crohn\textquoterights disease: UK population-based study (1995-2009)  a385-910 v21  a1078-0998