1. From the Department of Radiology and Biomedical Imaging, University of California San Francisco, Zuckerberg San Francisco General Hospital, 505 Parnassus Ave, Box 0628, Room 255, San Francisco, CA 94143 (H.H.C., D.J.S.); and Department of Medicine, Division of General Internal Medicine (S.K., R.K.F.), Department of Epidemiology and Biostatistics (C.Y.H., A.S.), and Department of Medicine, Division of Gastroenterology and Hepatology (M.K.), University of California San Francisco, San Francisco, Calif.