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Schoemaker MM, Niemeijer AS, Flapper BC, Smits-Engelsman BC.Schoemaker MM, et al.Dev Med Child Neurol. 2012 Apr;54(4):368-75. doi: 10.1111/j.1469-8749.2012.04226.x. Epub 2012 Feb 9.Dev Med Child Neurol. 2012.PMID: 22320829Free article.