Gjersing, Linn, Helge Waal, Jo Røislien, Michael Gossop, and Thomas Clausen. “Variations in Treatment Organisation, Practices and Outcomes Within the Norwegian Opioid Maintenance Treatment Programme”. Norsk Epidemiologi 21, no. 1 (December 28, 2011). Accessed May 7, 2024. https://www.ntnu.no/ojs/index.php/norepid/article/view/1434.