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Contributors WDP was involved in planning, conducting and reporting the data. MvM was involved in planning, conducting and reporting the data. HJB, PAJL and BWK were involved in planning and reporting the data.
Funding The study was fully funded by the Department of General Practice of the Erasmus University Medical Center, Erasmus MC.
Competing interests None declared.
Ethics approval The Institutional Review Board of the Erasmus University Medical Center, Erasmus MC, approved the study. Parents of all participating children gave informed consent, and children aged 12 years and older gave informed assent.
Provenance and peer review Not commissioned; externally peer reviewed.