1. Harvard Medical School Boston Massachusetts USA
2. VA Boston Health Care System Boston Massachusetts USA
3. American Board of Physical Medicine & Rehabilitation Rochester Minnesota USA
4. Mayo Clinic Phoenix Arizona USA
5. Mayo Clinic Rochester Minnesota USA
6. University of Texas Health Science Center McGovern Medical School Houston Texas USA
7. TIRR Memorial Hermann Hospital Houston Texas USA
8. University of Toronto, St. John's Rehabilitation Hospital Toronto Ontario Canada
9. University of Florida Gainesville Florida USA
10. University of Puerto Rico School of Medicine San Juan Puerto Rico