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Heep A, Bartmann P, Stoffel-Wagner B, Bos A, Hoving E, Brouwer O, Teelken A, Schaller C, Sival D.Heep A, et al. Among authors: bartmann p.Childs Nerv Syst. 2006 Oct;22(10):1249-55. doi: 10.1007/s00381-006-0102-y. Epub 2006 May 13.Childs Nerv Syst. 2006.PMID: 16699804