https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-31
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-33
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-32
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-27
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-29
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-30
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-28
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-34