1 Division of Cardiology, VA Greater Los Angeles Healthcare System and David Geffen School of Medicine at University of California Los Angeles, Los Angeles, California, USA.
2 North Coast Cardiology, Oceanside, California, USA.
3 INOVA Heart & Vascular Institute, Falls Church, Virginia, USA.
4 Department of Internal Medicine, University of Texas Southwestern, Dallas, Texas, USA.
5 Northside Hospital Cardiovascular Institute, Atlanta, Georgia, USA.
6 Heart and Vascular Center, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA.
7 St Vincent Heart Center, Indianapolis, Indiana, USA.
8 Division of Cardiology, University of Arizona, Phoenix, Arizona, USA.