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Bratland-Sanda S, Martinsen EW, Sundgot-Borgen J.Bratland-Sanda S, et al.Int J Environ Res Public Health. 2012 Jan;9(1):315-30. doi: 10.3390/ijerph9010315. Epub 2012 Jan 19.Int J Environ Res Public Health. 2012.PMID: 22470294Free PMC article.