1. Department of Cardiovascular Medicine; First Affiliated Hospital of Medical College, Xi'an Jiaotong University, and Institute of Cardiovascular Channelopathy, Key Laboratory of Environment and Genes Related to Diseases of Ministry of Education, Key Laboratory of Molecular Cardiology of Shaanxi Province; Xi'an, Shaanxi China
2. Department of Epidemiology and Health Statistics, School of Public Health; Xi'an Jiaotong University Medical College; Xi'an, Shaanxi China