1. Guidelines for postoperative pain therapy
2. 3Management of Severe Pain National Health and Medical Research Council Commonwealth Australia.
3. 4The Royal College of Surgeons of England and the College of Anaesthetists. Report of the Working Party on Pain after Surgery. London: HMSO.
4. 5US Department of Health and Human Services. Clinical Practice Guideline. Acute Pain Management: Operative or Medical Procedures and Trauma. Rockville, Maryland: Agency for Health Care and Policy and Research.