1. National Pain Survey. Conducted for Ortho-McNeil Pharmaceutical, 1999.
2. Approaches to Pain Management;Bartel,2003
3. Pain in America: A research report. Conducted for Merck by the Gallup Organization 2003.
4. Nonsteroidal antiinflamatory agents;Bruno,2000
5. Nonsteroidal antiinflammatory drugs—differences and similarities;Brooks;N Engl J Med,1991