[1] Jiangxi Prov Maternal & Child Hlth Hosp, Dept Obstet, 318 Bayi Ave, Nanchang 330006, Jiangxi Provinc, Peoples R China
[2] Nanchang Univ, Affiliated Hosp 2, Dept Urol, Nanchang 330006, Jiangxi Provinc, Peoples R China
[3] Baoji Gaoxin Hosp, Dept Endocrinol, Baoji 721006, Shanxi Province, Peoples R China
[4] Ganzhou Peoples Hosp, Dept Obstet & Gynecol, Ganzhou 341000, Jiangxi Provinc, Peoples R China