1. Department of Internal Medicine, Health Science Center, Ningbo University, Ningbo city, Zhejiang province, China
2. Center for Reproductive Medicine, Ningbo Women and Children’s Hospital, Ningbo city, Zhejiang province, China
3. School of Public Health, Health Science Center, Ningbo University, Ningbo city, Zhejiang province, China
4. Department of Medical Records and Statistics, Beilun People's Hospital, Ningbo city, Zhejiang province, China
5. Department of Obstetrics and Gynecology, Yinzhou District Maternal and Child Health Care Institute, Ningbo city, Zhejiang province, China
6. Zhejiang Key Laboratory of Pathophysiology, Health Science Center, Ningbo University, Ningbo city, Zhejiang province, China
7. Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Health Science Center, Ningbo University, Ningbo city, Zhejiang province, China