Cannabis combined with oxycodone for pain relief in fibromyalgia pain: a randomized clinical self-titration trial with focus on adverse events - van Dam, Cornelis Jan; Kramers, Cornelis; Schellekens, Arnt; Bouvy, Marcel; van Dorp, Eveline; Kowal, Mikael A.; Olofsen, Erik; Dahan, Albert; Niesters, Marieke; van Velzen, Monique (Frontiers in Pain Research, 2024)