https://health-policy-systems.biomedcentral.com/articles/10.1186/1478-4505-8-13
https://health-policy-systems.biomedcentral.com/articles/10.1186/1478-4505-8-15
https://health-policy-systems.biomedcentral.com/articles/10.1186/1478-4505-8-16
https://health-policy-systems.biomedcentral.com/articles/10.1186/1478-4505-8-17
https://health-policy-systems.biomedcentral.com/articles/10.1186/1478-4505-8-10
https://health-policy-systems.biomedcentral.com/articles/10.1186/1478-4505-8-12
https://health-policy-systems.biomedcentral.com/articles/10.1186/1478-4505-8-14
https://health-policy-systems.biomedcentral.com/articles/10.1186/1478-4505-8-11