1. Division of Pulmonary, Critical Care Medicine, Allergy, and Clinical Immunology, David Geffen School of Medicine at UCLA, Los Angeles, California
2. Division of Cardiology, Department of Medicine, UCLA Cardiac Arrhythmia Center, David Geffen School of Medicine at UCLA, Los Angeles, California
3. Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, California