1. Center for Reproductive Medicine, Provincial Hospital Affiliated to Shandong University, Jinan, People’s Republic of China
2. National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Key Laboratory for Reproductive Endocrinology of the Ministry of Education, and Shandong Provincial Key Laboratory of Reproductive Medicine, Jinan, People’s Republic of China
3. Center for Reproductive Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, People’s Republic of China
4. Shanghai Key Laboratory of Assisted Reproduction and Reproductive Genetics, Shanghai, People’s Republic of China