1. Dental Service, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, CA 90073, USA
2. Department of Cardiology, David Geffen/University of California, Los Angeles, Los Angeles, CA 90095, USA
3. Cardiology Division, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, CA 90073, USA
4. Graduate Medical Education, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, CA 90073, USA