1. National Engineering Research Center of Clean Technology in Leather Industry, Sichuan University, Chengdu 610065, China
2. Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, China
3. Department of Obstetrics and Gynecology, West China Second University Hospital, Sichuan University, Chengdu 610065, China
4. Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, Sichuan University, Chengdu 610065, China