Betrouwbare kennis over psychische problemen bij kinderen en jongeren

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Leckman, J.F., Riddle, M.A., Hardin. M.T., Ort, I., Swartz, K.L., Stevenson, J. & Cohen, D.J. (1989). The Yale Global Tic Severity Scale: initial testing of a clinician-rated scale of tic severity. Journal of the American Academy of Child and Adolescent Psychiatry, 28(4), 566–573. https://doi.org/10.1097/00004583-198907000-00015