Department of Internal Medicine, Erasmus University Medical Center, Postbus 2040, 3000 CA, Rotterdam, The Netherlands. Department of Epidemiology, Erasmus University Medical Center, Postbus 2040, 3000 CA, Rotterdam, The Netherlands. Section of Geriatric Medicine, Department of Internal Medicine, Academic Medical Centre, Amsterdam Public Health Research Institute, Postbus 22660, 1100 DD, Amsterdam-Zuidoost, The Netherlands. Department of Geriatric Medicine, Franciscus Gasthuis & Vlietland, Postbus 215, 3100 AE, Schiedam, The Netherlands. Department of Epidemiology and Biostatistics, Amsterdam Public Health Research Institute, VU University Medical Center, Postbus 7057, 1007 MB, Amsterdam, The Netherlands. Division of Human Nutrition and Health, Wageningen University, Postbus 9101, 6700 HB, Wageningen, The Netherlands. Department of Epidemiology, Erasmus University Medical Center, Postbus 2040, 3000 CA, Rotterdam, The Netherlands. J.C.Kiefte@lumc.nl. Department of Public Health and Primary Care, Leiden University Medical Center/LUMC Campus, The Hague, The Netherlands. J.C.Kiefte@lumc.nl.