1. From the Division of Cardiology, Department of Medicine, University of Oulu, Oulu, Finland (M.J.J., H.V.H.); Montreal Heart Institute and University of Montreal, Montreal, Canada (M.G., E.L., R.B.); Cardiology Department, Thorax Institute, Hospital Clinic, Barcelona, Spain (B.B., J.B.); Department of Cardiology, Academic Hospital Maastricht, Maastricht, Netherlands (K.V.); and Heart Rhythm Management Institute, UZ Brussel-VUB, Brussels, Belgium (A.S., P.B.).