1 Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, California; Division of General Internal Medicine, Cedars-Sinai Medical Center, Los Angeles, California.
2 Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, California.
3 Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, California; Department of Epidemiology and Population Health, Stanford University School of Medicine, Stanford, California.