1. Department of Internal Medicine, section of Gerontology and Geriatrics, Leiden University Medical Center, Leiden, Zuid-Holland, 2300 RC, the Netherlands
2. 2Department of Medical Statistics and Bioinformatics, section of Molecular Epidemiology, Leiden University Medical Center, Leiden, 2300 RC, the Netherlands
3. Department of Public Health and Primary Care, Leiden University Medical Center, Leiden, Zuid-Holland, 2300 RC, the Netherlands
4. Department of Public Health and Center for Healthy Aging, University of Copenhagen, Copenhagen, Hovedstaden,, 1014, Denmark