1. Department of Obstetrics, Obstetrics and Gynecology Hospital Affiliated to Nanjing Medical University, Nanjing, China
2. Department of Obstetrics, Lianyungang Maternity and Child Healthcare Hospital of Jiangsu, Lianyungang 222006, China
3. Laboratory of the Animal Center, Academy of Military Medical Sciences, Beijing, China
4. Department of Obstetrics and Gynecology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
5. Department of Obstetrics and Gynecology, The Second Affiliated Hospital, Medical School of Xi'an Jiaotong University, Xi’an 71004, China