[1]Nanfang Hosp, Gen Surg, Guangzhou, Guangdong, Peoples R China;
[2]Southern Med Univ, Nanfang Hosp, Gen Surg, Guangzhou, Guangdong, Peoples R China;
[3]Peking Univ Canc Hosp, Minimally Invas Gastrointestinal Surg, Beijing, Peoples R China;
[4]Fudan Univ, Zhongshan Hosp, Gen Surg, Shanghai, Peoples R China;
[5]Sichuan Univ, West China Hosp, Gen Surg, Chengdu, Sichuan, Peoples R China;
[6]Fujian Prov Hosp, Gastrointestinal Surg, Fuzhou, Fujian, Peoples R China;
[7]Sun Yat Sen Univ, Canc Ctr, Gastrointestinal Surg, Guangzhou, Guangdong, Peoples R China;
[8]Guangdong Gen Hosp, Gen Surg, Guangzhou, Guangdong, Peoples R China;
[9]Southern Med Univ, Gen Surg, Zhujiang Hosp, Guangzhou, Guangdong, Peoples R China;
[10]Sun Yat Sen Univ, Affiliated Hosp 3, Gen Surg, Guangzhou, Guangdong, Peoples R China;
[11]Sun Yat Sen Univ, Affiliated Hosp 6, Colorectal & Annal Surg, Guangzhou, Guangdong, Peoples R China;
[12]Meizhou Peoples Hosp, Gen Surg, Meizhou, Peoples R China;
[13]Zhongshan City People Hosp, Gen Surg, Zhongshan, Peoples R China;
[14]Guangzhou Med Univ, Canc Ctr, Abdominal Surg, Guangzhou, Guangdong, Peoples R China