[Li, Jia] Guangdong Med Univ, Dept Obstet & Gynecol, Grad Coll, Zhanjiang 524023, Guangdong, Peoples R China.
[Yin, ChunYan; Li, Jia; Mao, QiuXian] Guangdong 2 Prov Peoples Hosp, Dept Obstet & Gynecol, 466 Xingangdong Rd, Guangzhou 510317, Guangdong, Peoples R China.
[He, JingJun] Guangdong 2 Prov Peoples Hosp, Dept Phys Examinat, 466 Xingangdong Rd, Guangzhou 510317, Guangdong, Peoples R China.
[She, HaoQing] NanHua Univ, Dept Obstet & Gynecol, Coll Med, Hengyang 421001, Hunan, Peoples R China.
[Zhang, Zhi] Guangdong 2 Prov Peoples Hosp, Dept Lab Med, 466 Xingangdong Rd, Guangzhou 510317, Guangdong, Peoples R China.