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Fairclough SJ, Christian DL, Saint-Maurice PF, Hibbing PR, Noonan RJ, Welk GJ, Dixon PM, Boddy LM.Fairclough SJ, et al.Int J Environ Res Public Health. 2019 Oct 2;16(19):3711. doi: 10.3390/ijerph16193711.Int J Environ Res Public Health. 2019.PMID: 31581617Free PMC article.
Johnson R, Welk G, Saint-Maurice PF, Ihmels M.Johnson R, et al.Int J Environ Res Public Health. 2012 Apr;9(4):1411-26. doi: 10.3390/ijerph9041411. Epub 2012 Apr 16.Int J Environ Res Public Health. 2012.PMID: 22690202Free PMC article.