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Helbig I, Fölster-Holst R, Brasch J, Hausser I, van Baalen A, Muhle H, Alfke K, Caliebe A, Stephani U, Happle R.Helbig I, et al. Among authors: happle r.Eur J Pediatr. 2010 Apr;169(4):495-500. doi: 10.1007/s00431-009-1046-5. Epub 2009 Aug 26.Eur J Pediatr. 2010.PMID: 19707786