title: Author response.
authors: Everett J
authors: EJ
authors: Lehman
authors: Misty J
authors: MJ
authors: Hein
authors: Sherry L
authors: SL
authors: Baron
authors: Christine M
authors: CM
authors: Gersic
mesh_terms: D001265:Athletic Injuries; D002423:Cause of Death; D005538:Football; D006801:Humans; D008297:Male; D019636:Neurodegenerative Diseases; D012179:Retirement