1. Department of Reproductive Medicine, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
2. Key Laboratory of Reproductive Medicine of Guangdong Province, Guangdong, China
3. Key Laboratory for Major Obstetric Diseases of Guangdong Province, China, Guangdong
4. Key Laboratory of Reproduction and Genetics of Guangdong Higher Education Institutes, Guangdong, China