1. Infertility Center, Qilu Hospital of Shandong University, Jinan, China
2. Center for Reproductive Medicine, The General Hospital of Jinan Military Command, Jinan, China
3. Center for Reproductive Medicine, Hospital for Maternity and Child Care of Jinan City, Jinan, China
4. Neurology Lab, The General Hospital of Jinan Military Command, Jinan, China
5. Center for Reproductive Medicine, Henan Provincial Reproductive Hospital, Zhengzhou, China