1. Department of Endoscopy, The Number Two Hospital of Baoding, Baoding, Hebei 071000, China
2. Digestive Endoscopy Department, Hebei Province Chinese Medicine Hospital, No. 389 Zhongshan East Road, Shijiazhuang, Hebei 050011, China
3. Department of Nursing, The Number Two Hospital of Baoding, Baoding, Hebei 071000, China
4. Nuclear Magnetic Resonance Room, The Number Two Hospital of Baoding, Baoding, Hebei 071000, China