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Pervasive Developmental Disorder (PDD)
The term Pervasive Developmental Disorders (PDD) describes a group of five disorders: Autistic Disorder, Rett’s Syndrome, Childhood Disintegrative Disorder, Asperger’s Disorder, Pervasive Developmental Disorders (Not Otherwise Specified) [PDD (NOS)]. 

For reference to each disorder click here.
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