1. Clinical Epidemiology and Evidence‐Based Medicine Unit, National Clinical Research Center for Digestive Diseases, Beijing Friendship HospitalCapital Medical University Beijing China
2. Liver Research Center, Beijing Friendship HospitalCapital Medical University; Beijing Key Laboratory of Translational Medicine on Liver Cirrhosis; National Clinical Research Center for Digestive Diseases Beijing China
3. Statistics CenterBeijing Center for Diseases Prevention and Control Beijing China
4. Statistics CenterNational Health and Family Planning Commission of the People's Republic of China Beijing China