https://health-policy-systems.biomedcentral.com/articles/10.1186/1478-4505-4-11
https://health-policy-systems.biomedcentral.com/articles/10.1186/1478-4505-4-12
https://health-policy-systems.biomedcentral.com/articles/10.1186/1478-4505-4-13
https://health-policy-systems.biomedcentral.com/articles/10.1186/1478-4505-4-15
https://health-policy-systems.biomedcentral.com/articles/10.1186/1478-4505-4-10
https://health-policy-systems.biomedcentral.com/articles/10.1186/1478-4505-4-14