الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Pervasive developmental disorders also known as autistic disorders are a group of disorders charactized by language, social and behavioral impairments. The prevalence developmental disorders is rising and the research to discover the unknown etiology is also increasing . genitic inability to chelate heavy metals and keep trace elements ratios normal. The present study was conducted on 40 children matching the DSM-IV criteria for pervasive developmental disorders and 20 healthy sibling controls.