David L. Hayes, MD, is Consultant, Division of Cardiovascular Diseases and Internal Medicine at the Mayo Clinic and Mayo Foundation and Professor of Medicine at the Mayo Medical School, Rochester, Minnesota, USA. Samuel J. Asirvatham, MD, is Senior Associate Consultant and Assistant Professor of Medicine at the Mayo Clinic, Rochester, Minnesota, USA. Paul J. Wang, MD is Professor of Medicine and Director of the Cardiac Arrhythmia Service and Cardiac Electrophysiology Laboratory at Stanford University Medical Center, Stanford, California, USA. Jonathan D. Sackner-Bernstein, MD, is the Associate Chief of Cardiology and the Director of the Heart Failure Program at St. Lukes“s – Roosevelt Hospital Center in New York City; and an assistant professor of medicine at Columbia University, College of Physicians and Surgeons, USA.