Research in Developmental Disabilities (2013) - Comment
pubmed: 23123870  doi: 10.1016/j.ridd.2012.03.031  issn: 1873-3379  issn: 0891-4222 

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Johnny L. Matson, Timothy Dempsey, Santino V. LoVullo, Jill C. Fodstad, Cheryl Knight, Jay A. Sevin, Brenda Sharp