Gjersing L, Waal H, Røislien J, Gossop M, Clausen T. Variations in treatment organisation, practices and outcomes within the Norwegian Opioid Maintenance Treatment Programme. Nor J Epidemiol [Internet]. 2011Dec.28 [cited 2024Nov.21];21(1). Available from: https://www.ntnu.no/ojs/index.php/norepid/article/view/1434