https://resource-allocation.biomedcentral.com/articles/10.1186/1478-7547-8-5
https://resource-allocation.biomedcentral.com/articles/10.1186/1478-7547-8-7
https://resource-allocation.biomedcentral.com/articles/10.1186/1478-7547-8-4
https://resource-allocation.biomedcentral.com/articles/10.1186/1478-7547-8-6