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The North Karelia Youth Programs.
Vartiainen E, Tossavainen K, Viri L, Niskanen E, Puska P. Vartiainen E, et al. Among authors: viri l. Ann N Y Acad Sci. 1991;623:332-49. doi: 10.1111/j.1749-6632.1991.tb43743.x. Ann N Y Acad Sci. 1991. PMID: 2042842