https://ehjournal.biomedcentral.com/articles/10.1186/s12940-017-0339-9 https://ehjournal.biomedcentral.com/articles/10.1186/s12940-017-0341-2 https://ehjournal.biomedcentral.com/articles/10.1186/s12940-017-0333-2 https://ehjournal.biomedcentral.com/articles/10.1186/s12940-017-0321-6 https://ehjournal.biomedcentral.com/articles/10.1186/s12940-017-0334-1 https://ehjournal.biomedcentral.com/articles/10.1186/s12940-017-0337-y https://ehjournal.biomedcentral.com/articles/10.1186/s12940-017-0335-0 https://ehjournal.biomedcentral.com/articles/10.1186/s12940-017-0336-z