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Kölch M, Fegert JM.Kölch M, et al. Among authors: fegert jm.Prax Kinderpsychol Kinderpsychiatr. 2007;56(3):224-33. doi: 10.13109/prkk.2007.56.3.224.Prax Kinderpsychol Kinderpsychiatr. 2007.PMID: 17451152Review.German.