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de Koning WB, van Osch-Gevers M, Ten Harkel AD, van Domburg RT, Spijkerboer AW, Utens EM, Bogers AJ, Helbing WA.de Koning WB, et al.Eur J Pediatr. 2008 Sep;167(9):995-1004. doi: 10.1007/s00431-007-0626-5. Epub 2007 Nov 7.Eur J Pediatr. 2008.PMID: 17987315