[1]Stanford Univ, Med Ctr, Div Gastroenterol & Hepatol, Palo Alto, CA 94304 USA.
[2]Univ Calif San Diego, Dept Med, San Diego, CA 92103 USA.
[3]Univ Texas Med Branch, Sch Med, Galveston, TX 77555 USA.
[4]Shanghai Univ TCM, Shuguang Hosp, Inst Liver Dis, Dept Cirrhosis, Shanghai, Peoples R China.
[5]Zhejiang Univ, Sch Publ Hlth, Dept Epidemiol & Biostat, Hangzhou 310003, Zhejiang, Peoples R China.
[6]Stanford Univ, Palo Alto, CA 94304 USA.
[7]Stanford Univ, Sch Med, Ctr Clin Informat, Palo Alto, CA 94304 USA.
[8]Chinese Hosp, San Francisco, CA USA.