https://substanceabusepolicy.biomedcentral.com/articles/10.1186/s13011-017-0140-3
https://substanceabusepolicy.biomedcentral.com/articles/10.1186/s13011-018-0142-9
https://substanceabusepolicy.biomedcentral.com/articles/10.1186/s13011-018-0141-x
https://substanceabusepolicy.biomedcentral.com/articles/10.1186/s13011-017-0139-9
https://substanceabusepolicy.biomedcentral.com/articles/10.1186/s13011-017-0137-y