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Open Access Research article

Three-year follow-up of physical activity in Norwegian youth from two ethnic groups: associations with socio-demographic factors

Åse Sagatun*, Elin Kolle, Sigmund A Anderssen, Magne Thoresen and Anne Johanne Søgaard

BMC Public Health 2008, 8:419  doi:10.1186/1471-2458-8-419

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