1. Department of Obstetrics and Gynaecology, West China Second University Hospital, Sichuan University, Chengdu, China
2. West China School of Medicine, Sichuan University, Chengdu, China
3. Key Laboratory of Birth Defects and Related Diseases of Women and Children of the Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, China
4. Reproductive Centre, Department of Obstetrics and Gynaecology, West China Second University Hospital, Sichuan University, Chengdu, China
5. Outpatient Department, West China Second University Hospital, Sichuan University, Chengdu, China
6. SCU–CUHK Joint Laboratory for Reproductive Medicine, West China Second University Hospital, Sichuan University, Chengdu, China