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Schmidt SK, Hemmestad L, MacDonald CS, Langberg H, Valentiner LS.Schmidt SK, et al. Among authors: langberg h.Int J Environ Res Public Health. 2020 Oct 13;17(20):7454. doi: 10.3390/ijerph17207454.Int J Environ Res Public Health. 2020.PMID: 33066239Free PMC article.