Laura E Raffals1, Geoffrey C Nguyen2, David T Rubin3. 1. Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota. 2. Mount Sinai Hospital Centre for Inflammatory Bowel Disease, University of Toronto, Toronto, Canada. Electronic address: geoff.nguyen@utoronto.ca. 3. Inflammatory Bowel Disease Center, University of Chicago Medicine, Chicago, Illinois.