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Sacker A, Clarke P, Wiggins RD, Bartley M.Sacker A, et al. Among authors: wiggins rd.J Epidemiol Community Health. 2005 Jun;59(6):495-501. doi: 10.1136/jech.2004.026278.J Epidemiol Community Health. 2005.PMID: 15911646Free PMC article.