[1] Guangyuan Cent Hosp, Gastroenterol Dept, Guangyuan, Peoples R China
[2] Southwest Med Univ, Affiliated Hosp, Sch Clin Med, Luzhou, Peoples R China
[3] Dazhou Cent Hosp, Dept Gen Surg, Dazhou, Peoples R China
[4] Dazhou Cent Hosp, Oncol Dept, Dazhou, Peoples R China
[5] Dazhou Cent Hosp, Geriatr Dept, Dazhou, Peoples R China