1. Department of Cardiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China
2. Department of Cardiology, The First Affiliated Hospital of Henan University of TCM, Zhengzhou, Henan 450003, P.R. China
3. Department of Thoracic Surgery, Taicang Affiliated Hospital of Soochow University, Taicang, Jiangsu 210023, P.R. China