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Pollak E, Bullinger M, Jeske J, Wiegand-Grefe S.Pollak E, et al.Prax Kinderpsychol Kinderpsychiatr. 2008;57(4):301-14. doi: 10.13109/prkk.2008.57.4.301.Prax Kinderpsychol Kinderpsychiatr. 2008.PMID: 18575057German.