1. Department of Emergency Surgery The First Affiliated Hospital of Zhengzhou University Zhengzhou Henan China
2. Stomatological Center The First Affiliated Hospital of Zhengzhou University Zhengzhou Henan China
3. Department of Gynecology and Obstetrics The Second Affiliated Hospital of Zhengzhou University Zhengzhou Henan China
4. Research Office The First Affiliated Hospital of Zhengzhou University Zhengzhou Henan China