1. Division of Cardiology, The Permanente Medical Group, San Francisco, CA (A.P.A.).
2. Division of Research, Kaiser Permanente Northern California, Oakland (A.P.A.).
3. Center for Outcomes Research and Evaluation, Yale University School of Medicine, New Haven, CT (C.S.P.).
4. Division of Cardiology, Duke University Medical Center, Durham, NC (D.J.F., M.F., A.F.H., S.M.A.-K.).
5. Duke Clinical Research Institute, Durham, NC (D.J.F., M.F., A.F.H., S.M.A.-K.).
6. Division of Cardiology, Ahmanson-UCLA Cardiomyopathy Center, Ronald Reagan UCLA Medical Center, University of California (G.C.F.).
7. Division of Cardiology, University of Colorado Anschutz Medical Campus, Aurora (F.A.M.).