1. Division of Gastroenterology and Hepatology Stanford University Medical Center Palo Alto California USA
2. Department of Hepatology, Hepatology Research institute the First Affiliated Hospital, Fujian Medical University Fuzhou China
3. Department of Epidemiology and Population Health Stanford University School of Medicine Stanford California USA
4. The Third Affiliated Hospital Sun Yat‐Sen University Guangzhou China
5. Lane Medical Library Stanford University School of Medicine Stanford California USA
6. Division of Gastroenterology and Hepatology Veterans Affairs Palo Alto Health Care System Palo Alto California USA