[1] Peking Univ, Hosp 1, Dept Obstet & Gynecol, Beijing 100034, Peoples R China
[2] Sun Yat Sen Univ, Affiliated Hosp 1, Dept Obstet & Gynecol, Guangzhou 510080, Guangdong, Peoples R China
[3] Xi An Jiao Tong Univ, Affiliated Hosp 1, Coll Med, Dept Obstet & Gynecol, Xian 710061, Shaanxi, Peoples R China
[4] Aviat Gen Hosp, Dept Obstet & Gynecol, Beijing 100025, Peoples R China
[5] Tongzhou Maternal & Child Hlth Hosp Beijing, Dept Obstet & Gynecol, Beijing 101101, Peoples R China
[6] Maternal & Child Hlth Hosp Taiyuan, Dept Obstet & Gynecol, Taiyuan 030012, Shanxi, Peoples R China
[7] West China Second Univ Hosp, Dept Obstet & Gynecol, Chengdu 610041, Sichuan, Peoples R China
[8] Chongqing Med Univ, Affiliated Hosp 1, Dept Obstet & Gynecol, Chongqing 400042, Peoples R China
[9] Sun Yat Sen Univ, Sun Yat Sen Mem Hosp, Dept Obstet & Gynecol, Guangzhou 510120, Guangdong, Peoples R China
[10] Guangdong Women & Children Hosp, Dept Obstet & Gynecol, Guangzhou 510623, Guangdong, Peoples R China
[11] Boai Hosp Zhongshan, Dept Obstet & Gynecol, Zhongshan 528403, Guangdong, Peoples R China
[12] Shenzhen Peoples Hosp, Dept Obstet & Gynecol, Shenzhen 518020, Guangdong, Peoples R China
[13] Miyunxian Hosp, Dept Obstet & Gynecol, Beijing 101500, Peoples R China
[14] World Diabet Fdn, Gentofte, Denmark