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van der Wielen RP, de Wild GM, de Groot LC, Hoefnagels WH, van Staveren WA.van der Wielen RP, et al. Among authors: de wild gm.J Gerontol A Biol Sci Med Sci. 1996 Jan;51(1):B100-7. doi: 10.1093/gerona/51a.1.b100.J Gerontol A Biol Sci Med Sci. 1996.PMID: 8548493Free article.