1. Walter Reed National Military Medical Center, Bethesda, Maryland, USA
2. Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
3. Naval Health Clinic Annapolis, United States Naval Academy, Annapolis, Maryland, USA
4. Keller Army Community Hospital, United States Military Academy, West Point, New York, USA
5. Steadman Hawkins Clinic of the Carolinas, Greenville, South Carolina, USA
6. University of Arizona, Tucson, Arizona, USA
7. William Beaumont Army Medical Center, El Paso, Texas, USA
8. Warren Alpert Medical School, Brown University, Providence, Rhode Island, USA