1. Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC. (K.S.P., S.S., B.G.L, A.F.H., A.D.D.)
2. Department of Medicine, Duke University School of Medicine, Durham, NC. (K.S.P., B.G.L, A.F.H., A.D.D.)
3. Bluhm Cardiovascular Institute, Northwestern University, Chicago, IL (C.W.Y.).
4. Geffen School of Medicine, University of California at Los Angeles (G.C.F.).