1. Clinical Epidemiology and EBM Unit, National Clinical Research Center for Digestive Disease, Beijing Friendship Hospital, Capital Medical University, Beijing, China
2. Beijing Friendship Hospital, Capital Medical University, Beijing, China
3. National Clinical Research Center for Digestive Disease, Beijing Friendship Hospital, Capital Medical University, Beijing, China
4. Liver Research Center, Beijing Friendship Hospital, Capital Medical University; Beijing Key Laboratory of Translational Medicine on Liver Cirrhosis, Beijing, China
5. Department of Biostatistics & Bioinformatics, Duke University School of Medicine, Durham, North Carolina, USA