<qa>  What is the diagnosis of Pervasive Developmental Disorder?1. Subjects must have a diagnosis of autistic disorder 299.0 or Asperger s disorder 299.80, as determined using the Diagnostic and Statistical Manual-IV DSM-IV and confirmation with the Autism Diagnostic Interview-Revised Lord 1997 andor Autism Diagnostic Observation Scale ADOS. A diagnosis of Pervasive Developmental Disorder, or PDD, will not suffice for this protocol. 