https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-27
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-25
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-29
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-24
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-26
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-28