1. General Medical Department, The First Affiliated Hospital of Qiqihar Medical University, Qiqihar, Heilongjiang 161041, China
2. Operation Room, The First Affiliated Hospital of Qiqihar Medical University, Qiqihar, Heilongjiang 161041, China
3. Nursing Department, The First Affiliated Hospital of Qiqihar Medical University, Qiqihar, Heilongjiang 161041, China
4. Nursing Institute of Qiqihar Medical University, Qiqihar, Heilongjiang 161006, China