https://archpublichealth.biomedcentral.com/articles/10.1186/s13690-018-0267-3
https://archpublichealth.biomedcentral.com/articles/10.1186/s13690-018-0269-1
https://archpublichealth.biomedcentral.com/articles/10.1186/s13690-018-0265-5
https://archpublichealth.biomedcentral.com/articles/10.1186/s13690-018-0268-2
https://archpublichealth.biomedcentral.com/articles/10.1186/s13690-018-0266-4