American Medical Society for Sports Medicine position statement: concussion in sport
Kimberly G Harmon, Jonathan A Drezner, Matthew Gammons, Kevin M Guskiewicz, Mark Halstead, Stanley A Herring, Jeffrey S Kutcher, Andrea Pana, Margot Putukian, William O Roberts
British Journal of Sports Medicine Jan 2013, 47 (1) 15-26; DOI: 10.1136/bjsports-2012-091941