Gjerde H, Normann PT, Mørland J. Can the use of psychoactive drugs in the general adult population be estimated based on data from a roadside survey of drugs and driving?. Nor J Epidemiol [Internet]. 2011Dec.16 [cited 2024Nov.21];21(1). Available from: https://www.ntnu.no/ojs/index.php/norepid/article/view/1425