Is Long-Term Prognosis for Pervasive Developmental Disorder Not Otherwise Specified Different from Prognosis for Autistic Disorder? Findings from a 30-Year Follow-Up Study - Groholt, Berit; Sponheim, Eili; Mykletun, Arnstein; Myhre, Anne Margrethe; Mordre, Marianne; Knudsen, Ann Kristin (2011)