1. Institute of Cardiovascular Disease, Key Laboratory for Arteriosclerology of Hunan Province, University of South China, Hengyang, Hunan 421001, P.R. China
2. Medical College, Hunan University of Chinese Medicine, Changsha, Hunan 410208, P.R. China
3. Department of Pediatrics, Affiliated Nanhua Hospital, University of South China, Hengyang, Hunan 421001, P.R. China