1. Harvard Medical School, Boston, Massachusetts, USA.
2. Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.
3. Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
4. Vanderbilt Sports Concussion Center, Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
5. Cardiovascular Performance Program, Massachusetts General Hospital, Boston, Massachusetts, USA.
6. Department of Cardiology, Lausanne University Hospital (CHUV) and Institute for Sport Science, University of Lausanne (ISSUL), Lausanne, Switzerland.
7. Department of Orthopedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
8. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Charlestown, Massachusetts, USA.
9. Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, Massachusetts, USA.