1. Department of Cardiology (M.F.H., N.B., K.F.A.G., P.v.d.M.), University Medical Center Groningen, University of Groningen, The Netherlands.
2. Department of Cardiology and Angiology, Hannover Medical School, Germany (M.R.-H., S.P., D.H.-K.).
3. European Research Institute for the Biology of Aging (T.V.d.J.), University Medical Center Groningen, University of Groningen, The Netherlands.