https://ehjournal.biomedcentral.com/articles/10.1186/s12940-016-0208-y
https://ehjournal.biomedcentral.com/articles/10.1186/s12940-017-0211-y
https://ehjournal.biomedcentral.com/articles/10.1186/s12940-016-0206-0
https://ehjournal.biomedcentral.com/articles/10.1186/s12940-017-0210-z