https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-8-61
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-8-58
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-8-55
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-8-57
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-8-59
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-8-54
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-8-56
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-8-60