1Department of Medicine, Emory University School of Medicine, Atlanta, Georgia 30322 USA
2Second Clinic Hospital and the Norman Bethune University of Medical Sciences, Changchun, China 1320021
3Department of Medicine, Division of Cardiology, Emory University School of Medicine, Atlanta, Georgia 30322
4Emory Uni-versity School of Medicine, Division of Cardiology, 1639 Pierce Drive, WMB319, Atlanta, GA 30322.