https://bmcmedinformdecismak.biomedcentral.com/articles/10.1186/1472-6947-8-19
https://bmcmedinformdecismak.biomedcentral.com/articles/10.1186/1472-6947-8-20
https://bmcmedinformdecismak.biomedcentral.com/articles/10.1186/1472-6947-8-18