The Ritalin factor cites

1. "Methyphenidate decreases regional cerebral blood flow in normal humans" Life sciences Vol 54 no9 pl143-146 1994

2. "Cortical atrophy in young adults with a history of hyperactivity " Psychiatry research 17 241-246 1986

3. "hyperactive boys almost grown up" Salvatore Mannuzza PhD et al, Archives of general psychiatry, (48) 77-83 1991

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