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Welsh-Bohmer KA, Ostbye T, Sanders L, Pieper CF, Hayden KM, Tschanz JT, Norton MC; Cache Country Study Group.Welsh-Bohmer KA, et al.Clin Neuropsychol. 2009 Jan;23(1):77-99. doi: 10.1080/13854040801894730. Epub 2008 Jun 10.Clin Neuropsychol. 2009.PMID: 18609337Free PMC article.