1. The Reproductive Medical Center, Department of Obstetrics and Gynecology , West China Second University Hospital, Sichuan University , Chengdu , P.R. China
2. Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education , West China Second University Hospital, Sichuan University , Chengdu , P.R. China
3. Department of Laboratory Medicine , West China Second University Hospital, Sichuan University , Chengdu , P.R. China
4. Department of Dermatology , The First Hospital of China Medical University , Shenyang , P.R. China