1. Department of Cardiology Kaiser Permanente San Francisco Medical Center San Francisco California USA
2. Division of Research Kaiser Permanente Northern California Oakland California USA
3. Department of Health Systems Science Kaiser Permanente Bernard J. Tyson School of Medicine Pasadena California USA
4. Departments of Epidemiology, Biostatistics and Medicine University of California, San Francisco San Francisco California USA
5. Department of Medicine Stanford University Palo Alto California USA