• Genetic variation and cognitive dysfunction in opioid-treated patients with cancer 

      Kurita, Geana Paula; Ekholm, Ola; Kaasa, Stein; Klepstad, Pål; Skorpen, Frank; Sjøgren, Per (Peer reviewed; Journal article, 2016)
      Background and purpose The effects of single‐nucleotide polymorphisms (SNPs) on the cognitive function of opioid‐treated patients with cancer until now have not been explored, but they could potentially be related to ...
    • Tramadol use in Norway: A register-based population study 

      Birke, Hanne; Ekholm, Ola; Sjøgren, Per; Fredheim, Olav Magnus; Clausen, Thomas; Skurtveit, Svetlana (Journal article; Peer reviewed, 2018)
      Purpose Increasing use of tramadol for chronic non‐cancer pain is concerning since tramadol users may be at risk of developing recurrent opioid use with increasing opioid consumption and co‐medication. Therefore, we ...