https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-56
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-51
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-49
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-53
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-55
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-50
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-52
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-54