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Psycho-social and environmental correlates of location-specific physical activity among 9- and 15- year-old Norwegian boys and girls: the European Youth Heart Study
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* Corresponding author: Yngvar Ommundsen yngvar.ommundsen@nih.no
International Journal of Behavioral Nutrition and Physical Activity 2006, 3:32 doi:10.1186/1479-5868-3-32