1 Department of Cardiovascular Medicine, Heart Vascular and Thoracic Institute, Cleveland Clinic, Cleveland, Ohio; Department of Cardiology, Ziekenhuis Oost Limburg, Genk, Belgium; Department of Medicine and Life Science, Universiteit Hasselt, Hasselt, Belgium.
2 Cardiology Division, Massachusetts General Hospital, Boston, Massachusetts.
3 Department of Cardiology, Ziekenhuis Oost Limburg, Genk, Belgium; Department of Medicine and Life Science, Universiteit Hasselt, Hasselt, Belgium.
4 Department of Cardiovascular Medicine, Heart Vascular and Thoracic Institute, Cleveland Clinic, Cleveland, Ohio. Electronic address: tangw@ccf.org.