A prospective multicentre study to evaluate the efficacy and tolerability of osmotic release oral system (OROS) hydromorphone in opioid-naive cancer patients: Results of the Korean South West Oncology Group study

A prospective multicentre study to evaluate the efficacy and tolerability of osmotic release oral system (OROS) hydromorphone in opioid-naive cancer patients: Results of the Korean South West Oncology Group study