1. Keller Army Hospital, West Point, New York, USA
2. Medical College of Wisconsin, Milwaukee, Wisconsin, USA
3. United States Air Force Academy, Colorado Springs, Colorado, USA
4. MedStar Orthopaedic Institute, Washington, DC, USA
5. Michigan Concussion Center, University of Michigan, Ann Arbor, Michigan, USA
6. Indiana University School of Medicine, Indianapolis, Indiana, USA
7. Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA