1. The Chinese University of Hong Kong; Department of Obstetrics and Gynaecology; Prince of Wales Hospital Shatin New Territories Hong Kong
2. Jinan University; Department of Obstetrics and Gynecology; Huangpu Road West 601 Guangzhou China 510632
3. Zhejiang Chinese Medical University; College of Basic Medical Sciences; Hangzhou China
4. Zhejiang Chinese Medical University; First Clinical Medical College; Hangzhou China
5. Xuzhou Central Hospital; Department of Endocrinology; #199, South jiefang Rd Xuzhou Jiangsu province China 221009
6. Jinan University; Department Obstetrics and Gynecology; Huangpu Road West 601 Guangzhou China 510632