Kenneth D. Gadow, Jeffrey Sverd, Joyce Sprafkin et Edith E. Nolan, « Long-term Methylphenidate Therapy in Children With Comorbid Attention-Deficit Hyperactivity Disorder and Chronic Multiple Tic Disorder », Archives of General Psychiatry, vol. 56, no 4, , p. 330 (ISSN0003-990X, DOI10.1001/archpsyc.56.4.330, lire en ligne, consulté le )
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Kenneth D. Gadow, Jeffrey Sverd, Joyce Sprafkin et Edith E. Nolan, « Long-term Methylphenidate Therapy in Children With Comorbid Attention-Deficit Hyperactivity Disorder and Chronic Multiple Tic Disorder », Archives of General Psychiatry, vol. 56, no 4, , p. 330 (ISSN0003-990X, DOI10.1001/archpsyc.56.4.330, lire en ligne, consulté le )