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Perry J, Felce D.Perry J, et al. Among authors: felce d.Am J Ment Retard. 2005 Mar;110(2):121-35. doi: 10.1352/0895-8017(2005)110<121:FAWOIC>2.0.CO;2.Am J Ment Retard. 2005.PMID: 15762822