https://bmcmedinformdecismak.biomedcentral.com/articles/10.1186/1472-6947-11-49
https://bmcmedinformdecismak.biomedcentral.com/articles/10.1186/1472-6947-11-51
https://bmcmedinformdecismak.biomedcentral.com/articles/10.1186/1472-6947-11-50