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Cole SR, Hudgens MG, Brookhart MA, Westreich D. Cole SR, et al. Am J Epidemiol. 2015 Feb 15;181(4):246-50. doi: 10.1093/aje/kwv001. Epub 2015 Feb 5. Am J Epidemiol. 2015. PMID: 25660080 Free PMC article.