Vascular comorbidity is associated with decreased cognitive functioning in inflammatory bowel disease oleh Ronak Patel, Ruth Ann Marrie, Charles N. Bernstein, James M. Bolton, Lesley A. Graff, James J. Marriott, Chase R. Figley, Jennifer Kornelsen, Erin L. Mazerolle, Md Nasir Uddin, John D. Fisk, Comorbidity and Cognition in Multiple Sclerosis (CCOMS) Study Group