Bo Shen1, Gursimran Kochhar2, Tracy L Hull3. 1. Center for Inflammatory Bowel Diseases and Interventional IBD Unit, Cleveland Clinic, 9500 Euclid Ave, Cleveland, OH, USA. 2. Department of Gastroenterology, Allegheny General Hospital, Pittsburgh, PA, USA. 3. Department of Colorectal Surgery, Cleveland Clinic, Cleveland, OH, USA.