1. Institute of Pediatrics, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, P.R. China
2. Department of Obstetrics and Gynecology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou 510623, P.R. China
3. NHC Key Laboratory of Male Reproduction and Genetics, Family Planning Research Institute of Guangdong Province, Guangzhou, Guangdong 510600, P.R. China
4. Department of Obstetrics and Gynecology, the First People’s Hospital of Foshan, Foshan, Guangdong 528000, P.R. China
5. Department of Pathology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, Guangdong 510623, P.R. China
6. Department of Physiology, Medical College, Jinan University, Guangzhou, Guangdong 510632, P.R. China