1 The Department of Gynecology, Guangdong Second Provincial General Hospital, Guangzhou, Guangdong, China.
2 The Department of Reproductive Medicine Center, Guangdong Second Provincial General Hospital, Guangzhou, Guangdong, China. Electronic address: gaotianyangszyx@163.com.
3 The Department of Reproductive Medicine Center, Guangdong Second Provincial General Hospital, Guangzhou, Guangdong, China.
4 Department of Pathology, Guangdong Second Provincial General Hospital, Guangzhou, Guangdong, China.
5 The Department of Reproductive Medicine Center, Foshan Women and Children Hospital, Foshan, Guangdong, China.
6 The Department of Gynecology, Xiangzhou District People's Hospital, Xiangyang, Hubei, China.
7 Shijiazhuang Obstetrics and Gynecology Hospital, Shijiazhuang, Henan, China.