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van den Biggelaar AH, Gussekloo J, de Craen AJ, Frölich M, Stek ML, van der Mast RC, Westendorp RG.van den Biggelaar AH, et al. Among authors: stek ml.Exp Gerontol. 2007 Jul;42(7):693-701. doi: 10.1016/j.exger.2007.01.011. Epub 2007 Feb 4.Exp Gerontol. 2007.PMID: 17350781