1. Department of Emergency Medicine, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA.
2. Center for Neuroscience and Regenerative Medicine, Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, Maryland, USA.
3. Department of Athletics and Recreation, University of Rochester, Rochester, New York, USA.
4. Departments of Pediatrics and Emergency Medicine, Harvard Medical School, Boston, Massachusetts, USA.
5. Department of Kinesiology, Indiana University, Bloomington, Indiana, USA.
6. University of Rochester School of Medicine and Dentistry, Rochester, New York, USA.
7. Johns Hopkins School of Nursing and Medicine, Baltimore, Maryland, USA.