[1] Zhejiang Univ, Sch Med, 268 Kaixuan Rd, Hangzhou 310016, Zhejiang, Peoples R China
[2] Fudan Univ, Huashan Hosp, Dept Gen Surg, 12 Middle Urumqi Rd, Shanghai, Peoples R China
[3] Zhejiang Univ, Sch Med, Womens Hosp, Dept Obstet & Gynecol, 1st Xueshi Rd, Hangzhou 310006, Zhejiang, Peoples R China