1. From the Duke Clinical Research Institute, Duke University Medical Center, Durham, NC (S.V.D., R.D.L., K.R.W., C.B.G.); Division of Cardiology, University of Alberta, Edmonton, Alberta, Canada (S.V.D., P.W.A.); Faculty of Medicine, Charles University Prague, Czech Republic (P.W.); Henry Ford Hospital, Detroit, MI (W.D.W.); University Hospitals Leuven, Leuven, Belgium (F.V.D.W.); Universitaria Di Parma, Parma, Italy (D.A.); Isala Klinieken, Zwolle, The Netherlands (A.W.J.H.).