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Pervasive developmental disorder and childhood-onset schizophrenia: comorbid disorder or a phenotypic variant of a very early onset illness?

Early Onset IllnessPsychiatryPsychotic DisorderEarly Childhood DevelopmentCognitive DevelopmentPsychologySchizophreniaChildhood-onset SchizophreniaPervasive Developmental DisorderSocial SciencesMental HealthDevelopmental DisorderMedicinePsychopathologyChild Development