Hepatology Unit Department of Infectious Diseases Nanfang Hospital Southern Medical University Guangzhou Guangdong 510515 China;
Health Economics Research Institute Sun Yat-Sen University Guangzhou Guangdong 510085 China;
Department of Epidemiology and Biostatistics School of Public Health Xi'an Jiao Tong University Health Science Center Xi'an Shaanxi 710061 China;
Liver Research Center Beijing Friendship Hospital Capital Medical University Beijing 100050 China;
School of Public Health Peking University Beijing 100191 China;
School of Public Health Xi'an Jiao Tong University Health Science Center Xi'an Shaanxi 710061 China;