1. Department of Obstetrics & Gynecology, the First Affiliated Hospital, Anhui Medical University, Hefei, China.
2. Central Laboratory, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
3. Key Laboratory for Molecular Diagnosis of Hubei Province, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
4. Anhui Province Key Laboratory of Reproductive Health and Genetics, Hefei, China.