Southern Med Univ, Nanfang Hosp, Dept Gen Surg, Guangzhou, Guangdong, Peoples R China.
Fujian Med Univ, Union Hosp, Fuzhou, Peoples R China.
Fudan Univ, Zhongshan Hosp, Shanghai 200433, Peoples R China.
Peking Univ, Canc Hosp & Inst, Beijing 100871, Peoples R China.
Peking Univ, Canc Hosp & Inst, Dept Gastrointestinal Surg, Beijing 100871, Peoples R China.
Harbin Med Univ, Canc Hosp, Harbin, Peoples R China.
Sichuan Univ, West China Hosp, Chengdu 610064, Peoples R China.
Fourth Mil Med Univ, Tangdu Hosp, Xian 710032, Peoples R China.
Huazhong Univ Sci & Technol, Tongji Med Coll, Wuhan Union Hosp, Wuhan 430074, Peoples R China.
Shanghai Jiao Tong Univ, Renji Hosp, Coll Med, Dept Surg, Shanghai 200030, Peoples R China.
Jilin Univ, Bethune Hosp 1, Changchun 130023, Peoples R China.
Sun Yat Sen Univ, Affiliated Hosp 3, Guangzhou 510275, Guangdong, Peoples R China.
Shanghai Jiao Tong Univ, Sch Med, Ruijin Hosp, Shanghai 200030, Peoples R China.
Fujian Prov Canc Hosp, Fuzhou, Peoples R China.
Liberat Army Gen Hosp, Beijing, Peoples R China.
Southern Med Univ, Sch Publ Hlth, Dept Biostat, Guangzhou, Guangdong, Peoples R China.
Southern Med Univ, Nanfang Hosp, Guangzhou, Guangdong, Peoples R China.