Abstract of main article: Pervasive Developmental Disorders (PDD) refers to a group of disorders beginning in early childhood that cause severe impairment in social interaction and development of children.

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Sources list for:
"Autism symptoms Checklist, Aspergers Syndrome (PDD): Impairment of Child Development and Social Interaction"

1. Children's Aid Society (http://www.childaid.org/glossary.html) 2003
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