1. Department of Cardiology, Kaiser Permanente San Francisco Medical Center, San Francisco, California
2. Division of Research, Kaiser Permanente Northern California, Oakland
3. Department of Health Systems Science, Kaiser Permanente Bernard J. Tyson School of Medicine, Pasadena, California
4. Department of Medicine, Kaiser Permanente San Francisco Medical Center, San Francisco, California
5. Department of Cardiology, Kaiser Permanente Walnut Creek Medical Center, Walnut Creek, California
6. Novartis Pharmaceuticals Corporation, East Hanover, New Jersey
7. Departments of Epidemiology, Biostatistics and Medicine, University of California, San Francisco
8. Department of Medicine, Stanford University, Palo Alto, California