https://resource-allocation.biomedcentral.com/articles/10.1186/s12962-019-0191-6
https://resource-allocation.biomedcentral.com/articles/10.1186/s12962-019-0192-5
https://resource-allocation.biomedcentral.com/articles/10.1186/s12962-019-0190-7
https://resource-allocation.biomedcentral.com/articles/10.1186/s12962-019-0189-0