1. Department of Gynaecology, Maternal and Child Health Hospital of Hubei Province, Wuhan
2. Department of Medical Laboratory Technology, Shiyan Maternal and Child Health Hospital, Affiliated Hospital of Hubei University of Medicine, Shiyan
3. Department of Clinical Laboratory, Maternal and Child Health Hospital of Hubei Province, Wuhan
4. Department of Obestetrics, Renmin Hospital, Hebei University of Medicine, Shiyan
5. Pediatric Intensive Care Unit, Maternal and Child Health Hospital of Hubei Province, Wuhan, Hubei, PR China