1. Department of Medical Science, Yangzhou Polytechnic College, Yangzhou, Jiangsu 225127, P.R. China
2. Department of General Surgery, The First Affiliated Hospital of Soochow University, Soochow University, Suzhou, Jiangsu 215006, P.R. China
3. Section of Pacing and Electrophysiology, Division of Cardiology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi 341000, P.R. China