1. Department of General Practice, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570100, P.R. China
2. Hainan Medical University, Haikou, Hainan 570100, P.R. China
3. Department of Cardiology, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570100, P.R. China
4. Key Laboratory of Tropical Cardiovascular Diseases Research of Hainan Province, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570100, P.R. China