[1] Jiangyin Peoples Hosp, Dept Gynecol & Obstet, Jiangyin 214400, Jiangsu, Peoples R China
[2] Fifth Peoples Hosp Wuxi, Dept Gynecol, 1215 Guangrui Rd, Wuxi 214000, Jiangsu, Peoples R China
[3] Jiangnan Univ, Affiliated Hosp, Obstet & Gynecol Ward 2, Wuxi 214131, Jiangsu, Peoples R China