1. Department of Obstetrics and Gynecology, the First Affiliated Hospital of Sun Yat-Sen University, GuangZhou 510080, China
2. Department of Urology, the Sixth Affiliated Hospital of Sun Yat-Sen University, GuangZhou 510655, China
3. Reproductive Medicine Research Center, the Sixth Affiliated Hospital of Sun Yat-Sen University, GuangZhou 510655, China
4. Reproductive Medical Center, the First Affiliated Hospital of Sun Yat-Sen University, GuangZhou 510080, China
5. Center for Stem Cell Biology and Tissue Engineering, Sun Yat-Sen University, Guangzhou 510080, China