1. Reproductive Medicine Center, Xiangya Hospital of Central South University , Changsha, P.R. China
2. Clinical Research Center for Women’s Reproductive Health in Hunan Province , Changsha, P.R. China
3. National Clinical Research Center for Metabolic Diseases, Metabolic Syndrome Research Center, and Key Laboratory of Diabetes Immunology, Ministry of Education, The Second Xiangya Hospital of Central South University , Changsha, P.R. China