1. Center for Reproductive Medicine, Shandong University , Jinan, Shandong, China
2. Medical Integration and Practice Center, Shandong University , Jinan, Shandong, China
3. National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University , Jinan, Shandong, China
4. Center for Reproductive Medicine, General Hospital of Ningxia Medical University , Yinchuan, Ningxia, China
5. Department of Reproductive Medicine, the Second Hospital of Hebei Medical University , Shijiazhuang, Hebei, China
6. Center for Reproductive Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University , Shanghai, China
7. Center for Reproductive Medicine, Maternal and Child Health Hospital in Guangxi , Nanning, Guangxi, China
8. Department of Reproductive Medicine, Characteristic Medical Center of People's Armed Police , Tianjin, China
9. Center for Reproductive Medicine, The Second Hospital of Jilin University , Changchun, Jilin, China
10. Center for Reproductive Medicine, Affiliated Hospital of Weifang Medical University , Weifang, Shandong, China