1. From the Division of Cardiology (B.v.d.L., J.K., L.A., T.F.L.), Cardiovascular Centre, University Hospital, Zurich, and the Division of Cardiovascular Research (R.L., T.F.L.), Institute of Physiology, University Zurich-Irchel, Switzerland; the Department of Vitamin Research (C.-P.A., V.S.), F. Hoffmann-La Roche Ltd, Basel, Switzerland; the Multi-Imaging Centre (J.N.S.), University of Cambridge, Cambridge, UK; and the Department of Biology (M.B., V.U.), University of Konstanz, Germany.