1 Department of Gynecology, Reproductive Medicine Center, Zhejiang Provincial People's Hospital (People's Hospital of Hangzhou Medical College), Hangzhou, China; Qingdao University Medical College, Qingdao, China.
2 Hangzhou Medical College, Hangzhou, China.
3 Department of Gynecology, Reproductive Medicine Center, Zhejiang Provincial People's Hospital (People's Hospital of Hangzhou Medical College), Hangzhou, China. Electronic address: wangyanpeng@hmc.edu.cn.