1. Institute of Cardiovascular Disease, Key Laboratory for Arteriosclerology of Hunan Province, Hunan International Scientific and Technological Cooperation Base of Arteriosclerotic Disease, Hengyang Medical School, University of South China, Hengyang, Hunan, P.R. China.
2. Department of Cardiothoracic Surgery, The First Affiliated Hospital of University of South China, Hengyang, P.R. China.
3. University of South China of Nursing, Hengyang, P.R. China.