1. Division of Cardiac Electrophysiology, Geisinger Heart Institute, Wilkes-Barre, PA (P.V.).
2. Department of Cardiology, University of South Florida Morsani College of Medicine, Tampa, FL (B.H.).
3. Division of Cardiology, Virginia Commonwealth University, Richmond (K.A.E.).
4. Department of Clinical Nursing, Wroclaw Medical University, Wroclaw, Poland (J.G.).