https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-48
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-45
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-44
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-46
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-47