1. Nursing Department, The Second Affiliated Hospital of Qiqihar Medical University, Qiqihar 161000, China
2. Department of Gastroenterology, The Second Affiliated Hospital of Qiqihar Medical University, Qiqihar 161000, China
3. Department of General Surgery, The Second Affiliated Hospital of Qiqihar Medical University, Qiqihar 161000, China
4. Operating Room, The Fourth Affiliated Hospital of Harbin Medical University, Harbin 150000, China
5. Department of Etiology, Qiqihar Medical University, Qiqihar 161000, China