The Why Files Staff:
Terry Devitt
editor

Sarah Goforth
feature writer for this feature, and project assistant

S.V. Medaris
designer/illustrator

Darrell Schulte
webmaster

David Tenenbaum
feature writer for most features

Amy Toburen
content development
executive

Credits:

Tracey Covassin
Assistant professor, Department of Exercise Science, Shippensburg University

Kevin Guskiewicz
Research director, Center for the Study of Retired Athletes
Director, Sports Medicine Research Laboratory
Associate professor, Department of Exercise and Sport Science, University of North Carolina

Joseph Maroon
Team physician, Pittsburgh Steelers
Vice chair, Department of Neurosurgery, University of Pittsburgh

Frederick Mueller
Director, National Center for Catastrophic Sport Injury Research
Chair, Department of Exercise and Sport Science, University of North Carolina
Head, American Football Coaches Association Committee of Football Injuries

* Michael Stuart
Professor of orthopedic surgery, Mayo Clinic College of Medicine
Co-director, sports medicine center, Mayo Clinic, Minnesota

* denotes fact-checker

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