https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-65
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https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-61
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-63
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-62
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-64
https://ij-healthgeographics.biomedcentral.com/articles/10.1186/1476-072X-7-66