1. Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
2. Department of Cardiology, Huai'an First People's Hospital, Huai'an, Jiangsu 223300, P.R. China
3. Department of Epidemiology and Biostatistics, Ministry of Education, Key Laboratory for Modern Toxicology, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu 211166, P.R. China