https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-23
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-25
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-22
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-24
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-26
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-9-21