https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-4
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-5
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-2
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-1
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-3