1. Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Bengbu Medical College, Anhui, P. R. China
2. Department of Physiology, Bengbu Medical College, Bengbu, Anhui, P.R. China
3. Bengbu Medical College Key Laboratory of Cardiovascular and Cerebrovascular Diseases, Bengbu, Anhui, P.R. China
4. Clinical Medical College, Bengbu Medical College, Anhui, P. R. China