Independent Validation of a Self-Report Version of the IBD Disability Index (IBDDI) in a Population-Based Cohort of IBD Patients. Issue 4 (19th March 2018) - Shafer, LA; Walker, JR; Chhibba, T; Ivekovic, M; Singh, H; Targownik, LE; Peyrin-Biroulet, L; Gower-Rousseau, C; Sarter, H; Bernstein, CN