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Sperth M, Hofmann FH, Holm-Hadulla RM.Sperth M, et al.Psychother Psychosom Med Psychol. 2014 Jun;64(6):224-31. doi: 10.1055/s-0033-1358721. Epub 2013 Nov 18.Psychother Psychosom Med Psychol. 2014.PMID: 24248863German.