Safety and efficacy of oxycodone/naloxone vs. oxycodone vs. morphine in the treatment of chronic low back pain - a 12-week prospective (optionally randomized) open-label blinded endpoint streamlinded study with prolonged-release preparations (PROBE) First published 21/09/2015 Last updated 23/04/2024 EU PAS number:EUPAS11035 Study Finalised