Department of Cardiology, Zhejiang Hospital, Hangzhou, 310013, Zhejiang Province, China. Department of Ultrasonic, Taizhou Hospital Affiliated to Wenzhou Medical University, Linhai, 317000, Zhejiang Province, China. Department of Cardiology, Taizhou Hospital, Zhejiang University School of Medicine, Hangzhou, 310013, Zhejiang Province, China. Department of Cardiology, Taizhou Hospital Affiliated to Wenzhou Medical University, Linhai, 317000, Zhejiang Province, China. Laboratory of Cardiovascular Disease, Taizhou Hospital Affiliated to Wenzhou Medical University, Linhai, 317000, Zhejiang Province, China. Department of Surgery, Stanford University School of Medicine, Stanford, CA, 94305, USA. Department of Cardiology, Taizhou Hospital Affiliated to Wenzhou Medical University, Linhai, 317000, Zhejiang Province, China. xiaof.chen@yahoo.com. Laboratory of Cardiovascular Disease, Taizhou Hospital Affiliated to Wenzhou Medical University, Linhai, 317000, Zhejiang Province, China. xiaof.chen@yahoo.com. Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA. xiaof.chen@yahoo.com.