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Naess O, Strand BH, Smith GD.Naess O, et al. Among authors: strand bh.J Epidemiol Community Health. 2007 Nov;61(11):1004-9. doi: 10.1136/jech.2006.052811.J Epidemiol Community Health. 2007.PMID: 17933960Free PMC article.
Moe JO, Steingrímsdóttir ÓA, Strand BH, Grøholt EK, Næss Ø.Moe JO, et al. Among authors: strand bh.BMC Public Health. 2012 Oct 27;12:911. doi: 10.1186/1471-2458-12-911.BMC Public Health. 2012.PMID: 23101942Free PMC article.