1. Department of Endoscopy Fourth Hospital of Hebei Medical University Shijiazhuang Hebei China
2. Department of Scientific Research Center Fourth Hospital of Hebei Medical University Shijiazhuang Hebei China
3. Department of Pathology Fourth Hospital of Hebei Medical University Shijiazhuang Hebei China
4. Department of Gastroenterology Fourth Hospital of Hebei Medical University Shijiazhuang Hebei China