[1] Third Peoples Hosp Chengdu, Med Res Ctr, 82 Qinglong Rd, Chengdu 610031, Sichuan, Peoples R China
[2] Southwest Jiaotong Univ, Affiliated Hosp, Chengdu, Sichuan, Peoples R China
[3] Chongqing Med Univ, Chengdu Hosp Affiliated 2, Chengdu, Sichuan, Peoples R China
[4] 42 Hosp PLA, Dept Gen Surg, Leshan, Sichuan, Peoples R China