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Izquierdo-Gomez R, Martínez-Gómez D, Acha A, Veiga OL, Villagra A, Diaz-Cueto M; UP&DOWN study group.Izquierdo-Gomez R, et al.Res Dev Disabil. 2014 Feb;35(2):482-9. doi: 10.1016/j.ridd.2013.11.026. Epub 2013 Dec 25.Res Dev Disabil. 2014.PMID: 24374601