1. Department of Endocrinology and Metabolism, Peking University International Hospital, Beijing, China.
2. Department of Endocrinology and Metabolism, The First Hospital of Dandong City, Dandong, China.
3. The Endocrine Institute and The Liaoning Provincial Key Laboratory of Endocrine Diseases, Department of Endocrinology and Metabolism, The First Hospital of China Medical University, Shenyang, China.
4. Department of Obstetrics and Gynecology, Shenyang Women's and Children's Hospital, Shenyang, China.
5. Department of Obstetrics and Gynecology, No. 202 Hospital of People's Liberation Army, Shenyang, China.
6. Department of Obstetrics and Gynecology, Dalian Obstetrics and Gynecology Hospital, Dalian, China.
7. Department of Obstetrics and Gynecology, The First Hospital of China Medical University, Shenyang, China.
8. Department of Endocrinology, The First Affiliated Hospital of Dalian Medical University, Dalian, China.
9. Department of Endocrinology, No. 202 Hospital of People's Liberation Army, Shenyang, China.
10. Department of Endocrinology, Dalian Municipal Central Hospital Affiliated of Dalian Medical University, Dalian, China.
11. Department of Obstetrics and Gynecology, Shenyang Women and Children Health Care Center, Shenyang, China.