American football and the evolution of modern sports medicine.
Cahill
B R
BR
D005538:Football / Q000266:history* / Q000293:injuries; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D049691:History, Medieval; D006801:Humans; D009985:Orthopedics / Q000266:history; D012955:Societies, Medical / Q000266:history / Q000458:organization & administration; D013178:Sports Medicine / Q000266:history*; D014481:United States