[1] Beijing Hosp, Chinese Acad Med Sci, Inst Geriatr Med,Dept Gen Surg, Dept Hepatobilio Pancreat Surg,Natl Ctr Gerontol, Beijing 100730, Peoples R China
[2] Chinese Acad Med Sci & Peking Union Med Coll, Canc Hosp, Natl Clin Res Ctr Canc, Dept Hepatobiliary Surg,Natl Canc Ctr,Canc Hosp, Beijing, Peoples R China
[3] Beijing Hosp, Chinese Acad Med Sci, Beijing Inst Geriatr,Natl Ctr Gerontol, Inst Geriatr Med,Key Lab Geriatr,Natl Hlth Commis, Beijing, Peoples R China
[4] Beijing Hosp, Chinese Acad Med Sci, Inst Geriatr Med,Natl Hlth Commiss, Clin Biobank,Natl Ctr Gerontol,Natl Ctr Gerontol, Beijing, Peoples R China
[5] Chinese Acad Med Sci & Peking Union Med Coll, Canc Hosp, Natl Canc Data Ctr, Natl Canc Center,Nat Clin Res Ctr Canc, Beijing, Peoples R China
[6] Qinghai Univ, Dept Hepatopancreatobiliary Surg, Affiliated Hosp, Qinghai 810001, Peoples R China