https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-55
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-57
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-52
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-54
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-56
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https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-10-53