https://pophealthmetrics.biomedcentral.com/articles/10.1186/s12963-021-00254-3
https://pophealthmetrics.biomedcentral.com/articles/10.1186/s12963-021-00249-0
https://pophealthmetrics.biomedcentral.com/articles/10.1186/s12963-021-00250-7
https://pophealthmetrics.biomedcentral.com/articles/10.1186/s12963-021-00253-4