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Zuidema SU, van der Meer MM, Pennings GA, Koopmans RT.Zuidema SU, et al. Among authors: koopmans rt.Tijdschr Gerontol Geriatr. 2006 Mar;37(1):19-24.Tijdschr Gerontol Geriatr. 2006.PMID: 16529151Dutch.