1. Department of Anesthesiology; Mayo Clinic; Rochester Minnesota U.S.A.
2. Department of General Internal Medicine; Mayo Clinic; Rochester Minnesota U.S.A.
3. Pain Rehabilitation Center; Mayo Clinic; Rochester Minnesota U.S.A.
4. Health Services Research; Mayo Clinic; Rochester Minnesota U.S.A.
5. Mayo Medical School; Mayo Clinic; Rochester Minnesota U.S.A.