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Håberg SE, Bentdal YE, London SJ, Kvaerner KJ, Nystad W, Nafstad P.Håberg SE, et al. Among authors: kvaerner kj.Acta Paediatr. 2010 Jan;99(1):99-105. doi: 10.1111/j.1651-2227.2009.01506.x.Acta Paediatr. 2010.PMID: 19764924Free PMC article.