1. Department of Cardiology Renmin Hospital of Wuhan University Wuhan 430060 China
2. Cardiovascular Research Institute, Wuhan University Wuhan 430060 China
3. Hubei Key Laboratory of Cardiology Wuhan 430060 China
4. Department of Medicine Endocrinology Section and the Heart Rhythm Institute University of Oklahoma Health Sciences Center Oklahoma City OK 73104 USA
5. Cardiac Pacing and Electrophysiology Department The First Affiliated Hospital of Xinjiang Medical University Urumqi China