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2. Diagnostic and Statistical Manual of Mental Disorders, 3rd edition (DSM-III);American Psychiatric Association,1980
3. Diagnostic and Statistical Manual of Mental Disorders, 3rd edition-revised (DSM-III-R);American Psychiatric Association,1987
4. DSM-IV Draft Criteria;American Psychiatric Association,1993
5. Guidelines for hearing impairments and middle ear disorders;American Speech, Language, Hearing Association;ASHA,1990