https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-64 https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-66 https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-70 https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-68 https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-63 https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-65 https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-67 https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-69