1 University of California-Los Angeles (UCLA) Cardiac Arrhythmia Center, David Geffen School of Medicine, Los Angeles, California; UCLA Neurocardiology Research Center of Excellence, David Geffen School of Medicine, Los Angeles, CA. Electronic address: jardell@mednet.ucla.edu.
2 University of California-Los Angeles (UCLA) Cardiac Arrhythmia Center, David Geffen School of Medicine, Los Angeles, California; UCLA Neurocardiology Research Center of Excellence, David Geffen School of Medicine, Los Angeles, CA.