1. Division of Gastroenterology and Hepatology; Stanford University Medical Center; Palo Alto CA USA
2. Department of Infectious Diseases; The Second Affiliated Hospital of Xi’ an Jiaotong University; Xi'an China
3. Shaanxi Provincial Clinical Research Center for Hepatic & Splenic Diseases; The Second Affiliated Hospital of Xi'an Jiaotong University; Xi'an China
4. Department of General Internal Medicine; Kyushu University Hospital; Fukuoka Japan
5. Department of Lane Medical Library; Stanford University Medical Center; Palo Alto CA USA
6. National & Local Joint Engineering Research Center of Biodiagnosis and Biotherapy; The Second Affiliated Hospital of Xi'an Jiaotong University; Xi'an China
7. Division of Gastroenterology and Hepatology; Veterans Affairs Palo Alto Health Care System; Palo Alto CA USA