Mack, C. D., Wasserman, E. B., Perrine, C. G., MacNeil, A., Anderson, D. J., Myers, E., Smith, S., McDonald, L. C., Osterholm, M., Solomon, G. S., Mayer, T., Sills, A. Veröffentlicht in Morbidity and Mortality Weekly Report (MMWR) (2021) “...American football...”