1. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, Jiangsu, China
2. Department of Obstetrics and Gynecology, The First People’s Hospital of Lianyungang City, Affiliated Hospital of Xuzhou Medical University, Lianyungang 222000, China
3. Department of Clinical Laboratory, The First People’s Hospital of Lianyungang City, Affiliated Hospital of Xuzhou Medical University, Lianyungang 222000, China