From the Duke Clinical Research Institute (M.Y.C., S.K.M., L.G.A., M.L., C.M., J.H.A., R.A.H., R.C.B.), Durham, NC; Division of Cardiology (M.G.C.), University of North Carolina, Chapel Hill; Alaska Heart Institute (C.K.D.), Anchorage; Black Hills Cardiology (J.W.), Rapid City, SD; Cardiovascular Research Center (S.R.S.), University of Kentucky, Lexington; Hershey Medical Center (I.C.G.), Pennsylvania State University, Hershey; Methodist DeBakey Heart Center (N.S.K.), Baylor College of Medicine,... (At 2008-06-03)