[Deng, Yan; Ma, Rui-lin; Guo, Ying-ying; Wang, Yan-fang] Chinese Acad Med Sci & Peking Union Med Coll, Peking Union Med Coll Hosp, Dept Obstet & Gynecol, Beijing, Peoples R China.
[Zhang, Su-ying] Hunan Univ Chinese Med, Dept Obstet & Gynecol, Affiliated Hosp 2, Changsha, Peoples R China.
[Luo, Bin; Liu, Dong] Sichuan Univ, West China Hosp 2, Key Lab Birth Defects & Related Dis Women & Childr, Chengdu, Peoples R China.
[Luo, Bin; Liu, Dong] Sichuan Univ, Minist Educ, Chengdu, Peoples R China.
[Wang, Xue; Deng, Miao] Hangzhou Matern & Child Healthcare Hosp, Hangzhou Womens Hosp, Dept Obstet & Gynecol, Hangzhou, Peoples R China.