1 Department of Cardiology, Leiden University Medical Center, The Netherlands. Electronic address: l.e.zijlstra@lumc.nl.
2 Department of Cardiology and the Department of Gerontology and Geriatrics, Leiden University Medical Center, The Netherlands.
3 Department of Gerontology and Geriatrics, Leiden University Medical Center, Institute for Evidence-Based Medicine in Old Age (IEMO), The Netherlands.
4 Department of Nephrology, Leiden University Medical Center, The Netherlands; Department of Internal Medicine, Haga Hospital, The Hague, The Netherlands.
5 Department of Cardiology, Leiden University Medical Center, The Netherlands.