1. Department of Respiration II, The Third Affiliated Hospital of Qiqihar Medical University, Qiqihar, Heilongjiang 161006, P.R. China
2. Department of Respiratory Medicine, The Hospital of Qiqihar Medical University, Qiqihar, Heilongjiang 161006, P.R. China
3. Department of Neurology, The Third Affiliated Hospital of Qiqihar Medical University, Qiqihar, Heilongjiang 161006, P.R. China
4. Laboratory Center of Ultrastructural Pathology, Qiqihar Medical University, Qiqihar, Heilongjiang 161006, P.R. China
5. Department of Cardiovascular Medicine, Qiqihar Medical University, Qiqihar, Heilongjiang 161006, P.R. China