1 Division of Cardiology, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
2 Division of Cardiovascular Medicine, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA.
3 Department of Cardiovascular Medicine, Mayo Clinic, Rochester, Minnesota, USA.
4 Division of Cardiology, Department of Medicine, Northwestern University, Chicago, Illinois, USA.
5 Barbara Streisand Women's Heart Center, Cedars-Sinai Smidt Heart Institute, Los Angeles, California, USA.
6 Division of Cardiovascular Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
7 Division of Cardiology, Texas Cardiac Arrhythmia, Dallas, Texas, USA.