Conflict of interest statement Conflicts of Interest The authors report no conflicts of interest in this work. Similar articles Palliative Treatment of Cancer-Related Pain [Internet]. Oslo, Norway: Knowledge Centre for the Health Services at The Norwegian Institute of Public Health (NIPH); 2005 Dec. Report from Norwegian Knowledge Centre for the Health Services (NOKC) No. 09-2005. Oslo, Norway: Knowledge Centre for the Health Services at The Norwegian Institute of Public Health (NIPH); 2005 Dec.