1 Texas Cardiac Arrhythmia Institute, St. David's Medical Center, 3000 N. I-35, Suite 720, Austin, TX 78705, USA.
2 Department of Electrophysiology, Harvard Medical School, 90 Blossom Street, Boston, MA 02114, USA.
3 Interventional Electrophysiology, Scripps Clinic, 3000 N. I-35, Suite 720, San Diego, CA 78705, USA.
4 Department of Internal Medicine, Metro Health Medical Center, Case Western Reserve University School of Medicine, 3000 N. I-35, Suite 720, Cleveland, OH 78705, USA.