1. Department of Emergency Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, China
2. Department of Gastroenterology, Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou 450000, China
3. Department of Stomatology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, China
4. Department of Thyroid Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450000, China