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Darrow LA, Klein M, Flanders WD, Waller LA, Correa A, Marcus M, Mulholland JA, Russell AG, Tolbert PE.Darrow LA, et al.Epidemiology. 2009 Sep;20(5):689-98. doi: 10.1097/EDE.0b013e3181a7128f.Epidemiology. 2009.PMID: 19478670Free PMC article.
Darrow LA, Strickland MJ, Klein M, Waller LA, Flanders WD, Correa A, Marcus M, Tolbert PE.Darrow LA, et al.Epidemiology. 2009 Sep;20(5):699-706. doi: 10.1097/EDE.0b013e3181a66e96.Epidemiology. 2009.PMID: 19535987Free PMC article.
Strickland MJ, Klein M, Darrow LA, Flanders WD, Correa A, Marcus M, Tolbert PE.Strickland MJ, et al. Among authors: darrow la.J Epidemiol Community Health. 2009 Jun;63(6):500-4. doi: 10.1136/jech.2008.080499. Epub 2009 Feb 19.J Epidemiol Community Health. 2009.PMID: 19228684Free PMC article.