1. Department of Cardiology, Qianfoshan Hospital of Shandong Province, Jinan 250014, China
2. Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, Mississippi 39216;
3. Cardiovascular Surgery, Guangdong Cardiovascular Institute, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510080, China