1. Department of Gynecology and Obstetrics, Maternity and Child Healthcare Hospital Affiliated to Anhui Medical University, Anhui Province Maternity and Child Healthcare Hospital, Hefei, Anhui, China
2. Department of Gynecology and Obstetrics, The Fifth Clinical College of Anhui Medical University, Hefei, Anhui, China
3. Hefei Municipal Health Commission, Hefei, Anhui, China
4. Department of Neonatology, Anhui Province Maternity and Child Healthcare Hospital, Hefei, Anhui, China
5. Department of Clinical Laboratory, Anhui Province Maternity and Child Healthcare Hospital, Hefei, Anhui, China