1. From the Mayo Clinic, Rochester, Minn (A.S.J.); Aalborg University Hospital, Aalborg, Denmark (J.R.); Baylor College of Medicine, Houston, Tex (R.R.); Norrland University Hospital, Umea, Sweden (U.N.); Hennepin County Medical Center and the University of Minnesota, Minneapolis (F.S.A.); Ospedale G.B. Morgagni and Fondazione Cardiologica Sacco, Forlı̀, Italy (M.G.); and Universitat zu Lubeck, Lubeck, Germany (H.K.).