1. Division of Cardiology (L.H.), Department of Medicine, University of California, San Francisco.
2. Section of Cardiac Electrophysiology (N.G., A.O.), Department of Medicine, University of California, San Francisco.
3. Division of Cardiology, Department of Medicine, Zuckerberg San Francisco General Hospital, CA (N.G.).
4. Division of Cardiology, Department of Medicine, San Francisco Veterans Affairs Health Care System, CA (A.O.).