1. From the Arrhythmia and Electrophysiology Unit, Biocor Instituto, Nova Lima, Brazil (E.B.S., L.G., F.S., L.D.); Instituto de Pós-Graduação, Faculdade de Ciências Médicas de Minas Gerais, Belo Horizonte, Brazil (E.B.S.); Arrhythmia Associates, Mumbai, India (Y.L.); University Hospital, Maastricht, The Netherlands (C.T., H.J.J.W.), Cardiovascular Research Institute, Maastricht, The Netherlands (H.J.J.W.); and Heart Center, University of Leipzig, Leipzig, Germany (Y.H., G.H.).