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[Are memory courses effective?].
Koning-Haanstra M, Berg IJ, Bolhuis AB, Deelman BG. Koning-Haanstra M, et al. Tijdschr Gerontol Geriatr. 1993 Jun;24(3):97-104. Tijdschr Gerontol Geriatr. 1993. PMID: 8328010 Dutch.