1. Center for Reproductive Medicine, Shandong University , Jinan, China
2. Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University , Jinan, China
3. Shandong Key Laboratory of Reproductive Medicine , Jinan, China
4. The Affiliated Hospital of Qingdao University , Qingdao, China
5. Weifang People's Hospital , Weifang, China
6. Medical Integration and Practice Center, Shandong University , Jinan, China