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2. Comparison of two sets of accelerometer cut-off points for calculating moderate-to vigorous physical activity in young children;Cliff;J. Phys. Act. Health,2007
3. Do attributes in the physical environment influence children's physical activity? A review of the literature;Davison;IJBNPA,2006
4. De school als bron van mogelijkheden om fysiek actief te zijn in de kleuterfase. (The preschool as a source of physical activity);De Martelaer,2007
5. At least five a week,2004