1. Nursing Department, Qiqihar Medical University, Qiqihar, 161006 Heilongjiang, China
2. Cardiovascular Internal Medicine Ward 6, The Second Affiliated Hospital of Qiqihar Medical University, Qiqihar, 161006 Heilongjiang, China
3. Emergency Medicine, The Third Affiliated Hospital of Qiqihar Medical University, Qiqihar, 161006 Heilongjiang, China
4. Internal Medicine Ward 5, Staff Hospital of Qiqihar Machine Tool Group Co. Ltd., Qiqihar, 161006 Heilongjiang, China