editors, Sanjeev Saksena, MD, FACC, FESC, FAHA, FHRS, Clinical Professor of Medicine, UMDNJ-Robert Wood Johnson School of Medicine, Piscataway, New Jersery; Medical Director, Electrophysilolgy Research Foundation, Warren, New Jersey ; A. John Camm, MD,FRCP,FESC,FACC, Professor of Clinical Cardiology, Department of Cardiac and Vasular Sciences, St. George's Hospital Medical Centre, London, United Kingdom ; associate editors, Penelope A. Boyden, PhD, Professor, Department of Pharmacology and the Center for Molecular therapeutics, Columbia University, New York, New York ; Paul Dorian, MD,MSc,FRCPC, Director, Division of Cardiology, University of Toronto, St. Michael's Hospital, Toronto, Ontarion, Canada ; Nora Goldschlager, MD, FACP,FACC , Professor of Clinical Medicine, University of California-San Francisco School of Medicine; Associate Director, Cardiology Divison, Director, Clinical Cardiology, San Francisco, General Hospital, San Francisco, California ; Victoria L. Vetter, MD, MPH, Director, Youth Heart Watch, Professor of Pediatrics, University of Pennsylvania School of Medicine; Chief, Division of Cardiology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania ; Wojcie Zareba, MD, PhD, Professor of Medicine/Cardiology, University of Rochester Medical School, Rochester, New York.