1. Kirsch B, Berdine H, Zablotsky D, et al. Management strategy: identifying pain as the fifth vital sign. VHSJ. 2000;49–59.
2. Health Care Advisory Board. Pain Management in the VA and the Private Sector. Washington, DC: The Advisory Board Company; 1998.
3. Jacox A, Carr DB, Payne R, et al. Management of Cancer Pain. Clinical Practice Guideline No.9. AHCPR Publication No. 94-0592. Rockville, MD. Agency for Health Care Policy and Research, U.S. Department of Health and Human Services. Public Health Service, March 1994.
4. American Pain Society Quality of Care Committee. Quality improvement guidelines for the treatment of acute pain and cancer pain. JAMA. 1995;274:1874–80.
5. American Pain Society. Principles of Analgesic Use in the Treatment of Acute Pain and Cancer Pain. 4th edn. Glenview, IL: American Pain Society; 1999.