1. Division of Cardiology, University of Colorado Anschutz Medical Campus, Aurora
2. Section of Cardiovascular Medicine, Department of Medicine, Yale University School of Medicine, New Haven, Connecticut
3. Center for Outcomes Research and Evaluation, Yale-New Haven Hospital, New Haven, Connecticut
4. Section of Cardiac Electrophysiology, Division of Cardiology, University of California, San Diego, La Jolla
5. Division of Cardiology, Denver Health Hospital, Denver, Colorado