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Chang ET, Montgomery SM, Richiardi L, Ehlin A, Ekbom A, Lambe M.Chang ET, et al.Cancer Epidemiol Biomarkers Prev. 2004 Jul;13(7):1236-43.Cancer Epidemiol Biomarkers Prev. 2004.PMID: 15247136
Silfverdal SA, Ehlin A, Montgomery SM.Silfverdal SA, et al.Acta Paediatr. 2009 Apr;98(4):715-9. doi: 10.1111/j.1651-2227.2008.01180.x. Epub 2008 Dec 24.Acta Paediatr. 2009.PMID: 19133867