1. Department of Clinical Laboratory, Anhui Provincial Maternity and Child Health Hospital, Hefei, China
2. Department of Ultrasound, Anhui Provincial Maternity and Child Health Hospital, Hefei, China
3. Department of Science and Education, Anhui Provincial Maternity and Child Health Hospital, Hefei, China
4. Department of Obstetrics and Gynecology, Anhui Provincial Maternity and Child Health Hospital, Hefei, China
5. Department of Clinical Laboratory, Lu’an City Jin’an District Maternal and Child Health Care Hospital, Lu’an, China
6. Department of Clinical Laboratory, Fuyang Women and Children’s Hospital, Fuyang, China
7. Department of Obstetrics and Gynecology, Lu’an City Maternal and Child Health Care Hospital, Lu’an, China
8. Prenatal Screening Center, Bozhou Women and Children’s Health Hospital, Bozhou, China
9. Ministry of Women’s Health, Chuzhou Maternal and Child Care Family Planning Service Center, Chuzhou, China