1. Division of Cardiology, Department of Medicine, UT Southwestern Medical Center, Dallas, TX (N.K., V.S., A.P.).
2. Parkland Health and Hospital System, Dallas, TX (N.K., V.S., A.P.).
3. Division of Cardiology, Duke University Medical Center, Durham, NC (C.A.W., S.J.G., A.D.D.).
4. Duke Clinical Research Institute, Durham, NC (N.S., B.A., S.J.G., A.D.D.).
5. Division of Cardiology, Feinberg School of Medicine, Northwestern University, Chicago, IL (C.W.Y.).
6. Division of Cardiology, University of Colorado Medical Center, Aurora (L.A.A.).
7. Ronald Reagan-UCLA Medical Center, Los Angeles, CA (G.C.F.).