1. Department of Obstetrics and Gynecology, Third Affiliated Hospital of Guangzhou Medical College, Key Laboratory for Major Obstetric Diseases of Guangdong Province, Guangzhou, China
2. State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen (Zhongshan) University (East Campus), Guangzhou, China
3. Department of Histology and Embryology, Medical School of Sun Yet-Sen University, Guangzhou, China