1. Department of Obstetrics and Gynecology Shanghai First Maternity and Infant Hospital Tongji University School of Medicine Shanghai China
2. Department of Obstetrics and Gynecology The First Affiliated Hospital Shihezi University School of Medicine Xinjiang China
3. Chongqing Health Center for Women and Children Chongqing China
4. Department of Pathology Shanghai First Maternity and Infant Hospital Tongji University School of Medicine Shanghai China