1. Endoscope Room, Department of General Surgery, Cangzhou Central Hospital, Cangzhou 061001, Hebei Province, China
2. Medical College of Hebei University, Shijiazhuang 050011, Hebei Province, China
3. The First Department of General Surgery, Cangzhou Central Hospital, Cangzhou 061001, Hebei Province, China
4. Integrated Chinese and Western Medicine, Hebei University of Chinese Medicine, Shijiazhuang 050020, Hebei Province, China
5. Department of Neurosurgery, Affiliated Hospital of Hebei University, Baoding 071000, Hebei Province, China
6. Hebei University, Baoding 071002, Hebei Province, China