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Ram N, Conroy DE, Pincus AL, Lorek A, Rebar A, Roche MJ, Coccia M, Morack J, Feldman J, Gerstorf D.Ram N, et al.Res Hum Dev. 2014;11(2):142-160. doi: 10.1080/15427609.2014.906739. Epub 2014 May 14.Res Hum Dev. 2014.PMID: 26989350Free PMC article.