1. Section of Cardiology, Department of Medicine San Francisco Veterans Affairs Health Care System San Francisco California USA
2. Department of Medicine University of California, San Francisco School of Medicine San Francisco California USA
3. Philip R. Lee Institute for Health Policy Studies University of California, San Francisco School of Medicine San Francisco United States
4. Veterans Affairs Portland Health Care System Portland Oregon USA
5. Knight Cardiovascular Institute, Oregon Health and Sciences University Portland Oregon USA
6. Section of General Internal Medicine, Department of Medicine San Francisco Veterans Affairs Health Care System San Francisco California USA