1. From Cardiology (L.E.S., D.H., F.R., R.C., F.E., T.L., G.N.), University Hospital, Zürich; the Department of Clinical Research (S.S.), Inselspital, Bern; Division of Hypertension and Vascular Medicine (D.H.), Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland; and Cardiology (J.E.D.), Great Ormond Street Hospital for Children, London, UK.