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https://ehjournal.biomedcentral.com/articles/10.1186/s12940-015-0023-x
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https://ehjournal.biomedcentral.com/articles/10.1186/s12940-015-0008-9
https://ehjournal.biomedcentral.com/articles/10.1186/s12940-015-0021-z
https://ehjournal.biomedcentral.com/articles/10.1186/s12940-015-0022-y
https://ehjournal.biomedcentral.com/articles/10.1186/s12940-015-0019-6
https://ehjournal.biomedcentral.com/articles/10.1186/s12940-015-0020-0