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Sherpa LY, Deji, Stigum H, Chongsuvivatwong V, Thelle DS, Bjertness E.Sherpa LY, et al. Among authors: stigum h.Int J Environ Res Public Health. 2010 Apr;7(4):1670-80. doi: 10.3390/ijerph7041670. Epub 2010 Apr 13.Int J Environ Res Public Health. 2010.PMID: 20617052Free PMC article.