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Cognitive impairment in the Amish: a four county survey.
Johnson CC, Rybicki BA, Brown G, D'Hondt E, Herpolsheimer B, Roth D, Jackson CE. Johnson CC, et al. Int J Epidemiol. 1997 Apr;26(2):387-94. doi: 10.1093/ije/26.2.387. Int J Epidemiol. 1997. PMID: 9169175