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Olff M, Sijbrandij M, Opmeer BC, Carlier IV, Gersons BP.Olff M, et al. Among authors: gersons bp.J Anxiety Disord. 2009 Jun;23(5):656-9. doi: 10.1016/j.janxdis.2009.02.003. Epub 2009 Feb 11.J Anxiety Disord. 2009.PMID: 19282141