https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-17
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-12
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-15
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-14
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-16
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-13