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van der Leeden AJ, van Widenfelt BM, van der Leeden R, Liber JM, Utens EM, Treffers PD.van der Leeden AJ, et al. Among authors: treffers pd.Behav Cogn Psychother. 2011 Jan;39(1):55-75. doi: 10.1017/S1352465810000500. Epub 2010 Oct 8.Behav Cogn Psychother. 2011.PMID: 20932360Clinical Trial.