1. The First Affiliated Hospital of Zhengzhou University, Reproductive Medicine, Zhengzhou, China
2. Sir Run Run Shaw Hospital of Zhejiang University, Reproductive Medicine, Hangzhou, China
3. Southern Medical University, Reproductive Medicine, Guangzhou, China
4. Second Affiliated Hospital of Wenzhou Medical University, Reproductive Medicine, Wenzhou, China
5. Peking University Shenzhen Hospital, Reproductive Medicine, Shenzhen, China
6. Hainan Medical College, Reproductive Medicine, Haikou, China