https://resource-allocation.biomedcentral.com/articles/10.1186/s12962-019-0197-0
https://resource-allocation.biomedcentral.com/articles/10.1186/s12962-019-0195-2
https://resource-allocation.biomedcentral.com/articles/10.1186/s12962-019-0193-4
https://resource-allocation.biomedcentral.com/articles/10.1186/s12962-019-0196-1
https://resource-allocation.biomedcentral.com/articles/10.1186/s12962-019-0194-3