Journal of Autism and Developmental Disorders (2009) - Comment
pubmed: 18600440  doi: 10.1007/s10803-008-0611-5  issn: 0162-3257  issn: 1573-3432 

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Sander Begeer, Saloua El Bouk, Wafaa Boussaid, Mark Meerum Terwogt, Hans M. Koot