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Westerterp KR, Meijer EP.Westerterp KR, et al. Among authors: meijer ep.J Gerontol A Biol Sci Med Sci. 2001 Oct;56 Spec No 2:7-12. doi: 10.1093/gerona/56.suppl_2.7.J Gerontol A Biol Sci Med Sci. 2001.PMID: 11730240Review.