aDepartment of Medicine, Stanford University, Stanford

bDivision of Gastroenterology, University of California, San Francisco, San Francisco

cDivision of Gastroenterology and Hepatology, Stanford University, Stanford, California, USA

Correspondence to Allison Kwong, MD, 430 Broadway Street, 3rd Floor, Redwood City, CA 94063, USA. E-mail: [email protected]