[1] Shandong Univ, Dept Gen Surg, Qilu Hosp, Jinan, Peoples R China
[2] Shandong First Med Univ, Shandong Canc Hosp & Inst, Dept Radiat Oncol, Shandong Acad Med Sci, Jinan, Peoples R China
[3] Univ Queensland, Sch Publ Hlth, Brisbane, Qld, Australia
[4] Linyi Canc Hosp, Dept Gen Surg, Linyi, Peoples R China
[5] Zibo Cent Hosp, Dept Gen Surg, Zibo, Peoples R China
[6] Shengli Oilfield Cent Hosp, Dept Gen Surg, Dongying, Peoples R China
[7] Donge Peoples Hosp, Dept Gen Surg, Liaocheng, Peoples R China
[8] Liaocheng Peoples Hosp, Dept Hepatobiliary Surg, Liaocheng, Peoples R China
[9] Shandong Univ, Dept Gen Surg, Qilu Hosp Qingdao, Qingdao, Peoples R China