Reports of the benefits of drug use from individuals with substance use disorders. Bjørnestad, J. R.l; Veseth, M.; Berg, H.; Davidson, L.; McKay, J. R..; Moltu, C.; Skaalevik, A. W.; Slyngstad, T. E.; Svendsen, T. S.; Nesvåg, S. M. (2019). Philosophical Psychology.Journal of Medical Internet Research''. ISSN 1438-8871. Volum 21. Hefte 6. s. 1-22. DOI: 10.2196/13957.