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Harfterkamp M, Buitelaar JK, Minderaa RB, van de Loo-Neus G, van der Gaag RJ, Hoekstra PJ.Harfterkamp M, et al. Among authors: hoekstra pj.J Child Adolesc Psychopharmacol. 2013 Apr;23(3):194-9. doi: 10.1089/cap.2012.0012. Epub 2013 Apr 11.J Child Adolesc Psychopharmacol. 2013.PMID: 23578015Clinical Trial.