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Kieling C, Kieling RR, Rhode LA, Canino G, Klien R, Leibenluft E, Pine D, Frick PJ, Moffitt TE, Nigg JT, Taylor E, Rannock R, Shaffer D, Castellanos X. The age-of onset of attention-deficit hyperactivity disorder. American Journal of Psychiatry. 2010;167:718–719.