1. Department of Obstetrics and Gynecology, Huai ‘An Maternal and Child Health Hospital, Huai ‘An City, PR. China
2. Global Health Institute, Xi’an Jiaotong University, Xian City, PR. China
3. Department of Clinical Laboratory, First Affiliated Hospital of Xi’an Jiaotong University, Xian City, PR. China
4. Department of Reproductive Medicine, First Affiliated Hospital of Xi’an Jiaotong University, Xian City, PR. China