https://substanceabusepolicy.biomedcentral.com/articles/10.1186/s13011-017-0126-1
https://substanceabusepolicy.biomedcentral.com/articles/10.1186/s13011-017-0127-0
https://substanceabusepolicy.biomedcentral.com/articles/10.1186/s13011-017-0128-z