1. Texas Chiropractic College, Pasadena, TX, USA.
2. Private Practice, Santee, CA, USA.
3. Advanced Medicine Integration Group, L.P., Columbus, OH, USA.
4. VA Puget Sound Health Care System, Tacoma, WA, USA.
5. Palmer Center for Chiropractic Research, Davenport, IA, USA.
6. Private Practice, Grand Forks, ND, USA.
7. Private Practice, Greenbelt, MD, USA.
8. Private Practice, Eureka, CA, USA.
9. VA Northern CA Health Care System, Redding, CA, USA.
10. Seattle, WA, USA.