1. Reproductive Medicine Center, Nanfang Hospital, Southern Medical University, Guangzhou, China
2. Reproductive Medicine Center, People’s Hospital of Qingyuan, The Sixth Affiliated Hospital of Guangzhou Medical University, Qingyuan, China
3. Department of Pathology, People’s Hospital of Qingyuan, The Sixth Affiliated Hospital of Guangzhou Medical University, Qingyuan, China
4. Department of Laboratory, People’s Hospital of Qingyuan, The Sixth Affiliated Hospital of Guangzhou Medical University, Qingyuan, China
5. Department of Gynaecology and Obstetrics, People’s Hospital of Qingyuan, The Sixth Affiliated Hospital of Guangzhou Medical University, Qingyuan, China