Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands. Department of Public Health and Primary Care, Strangeways Research Laboratory, University of Cambridge, United Kingdom. Department of Public Health, Section for Epidemiology, Aarhus University, Aarhus, Denmark. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands; Department of Epidemiology and Biostatistics, Amsterdam Public Health Research Institute, VU Medical Centre, Amsterdam, the Netherlands. MRC Epidemiology Unit, University of Cambridge, Cambridge CB2 0QQ, United Kingdom. Department of Public Health, Section for Epidemiology, Aarhus University, Aarhus, Denmark; National Food Institute, Division for Diet, Disease Prevention and Toxicology, Technical University of Denmark, Kgs. Lyngby, Denmark. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands. Electronic address: i.sluijs-2@umcutrecht.nl.