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Littman AJ, Boyko EJ, Jacobson IG, Horton J, Gackstetter GD, Smith B, Hooper T, Wells TS, Amoroso PJ, Smith TC; Millennium Cohort Study.Littman AJ, et al. Among authors: boyko ej.BMC Med Res Methodol. 2010 Oct 21;10:99. doi: 10.1186/1471-2288-10-99.BMC Med Res Methodol. 2010.PMID: 20964861Free PMC article.