Corresponding Author

Reproductive Medicine Center, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China

Guangdong Provincial Key Laboratory of Reproductive Medicine, Guangzhou, China

Correspondence: Canquan Zhou, The First Affiliated Hospital, Sun Yat-sen University, Obstetrics and Gynecology, 1, Zhongshan Er Road, Guangzhou, Guangdong 510080, China.

Email: zhoucanquan@mail.sysu.edu.cn