1. Division of Cardiovascular Disease, Creighton University School of Medicine , Omaha, NE , USA
2. Hospital Universitari i Politecnic La Fe , Valencia , Spain
3. Centro de Investigación Biomedica en Red (CIBERCV) , Madrid , Spain
4. Department of Medicine, Georgetown University , Washington, DC , USA
5. Section of Interventional Cardiology, MedStar Washington Hospital Center , Washington, DC , USA