1 Department of Pediatric Neurosurgery, West China Second University Hospital, Sichuan University; Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, Sichuan, China.
2 Department of Epidemiology, College of Preventive Medicine, Third Military Medical University, Chongqing, China.
3 Department of Obstetrics and Gynaecology, Centre for Reproductive Medicine, West China Second University Hospital; Sichuan Provincial Key Laboratory of Development and Related Diseases of Women and Children, Chengdu , Sichuan, China.
4 Department of Gynecology and Obstetrics, West China Second University Hospital, Sichuan University, Chengdu, 610041, Sichuan, China.