1. Center for Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong University, 157 Jingliu Road, Jinan, China
2. National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Key Laboratory of Reproductive Endocrinology (Shandong University), Ministry of Education, 157 Jingliu Road, Jinan, China
3. Shandong Provincial Key Laboratory of Reproductive Medicine, 157 Jingliu Road, Jinan, China
4. Center for Reproductive Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai Key Laboratory for Assisted Reproduction and Reproductive Genetics, 845 Lingshan Road, Shanghai, China