1. From the Center for Clinical and Genetic Economics (M.A.G., K.A.S., L.H.C.), Duke Clinical Research Institute (S.M.A., E.D.P., A.F.H.), and the Divisions of Cardiology (S.M.A., E.D.P., A.F.H.) and General Internal Medicine (K.A.S., L.H.C.), Department of Medicine, Duke University School of Medicine, Durham, NC