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Kikkert HK, DE Jong C, Hadders-Algra M.Kikkert HK, et al.Dev Med Child Neurol. 2011 Apr;53(4):e16-25. doi: 10.1111/j.1469-8749.2010.03879.x.Dev Med Child Neurol. 2011.PMID: 21401578Free article.