1. Nonfatal traumatic brain injuries related to sports and recreation activities among persons aged ?19 years – United States, 2001–2009;Centers for Disease Control and Prevention;MMWR,2011
2. Sport and recreation-related head injuries treated in the emergency department;Kelly;Clin J Sport Med,2001
3. Concussions among United States high school and collegiate athletes;Gessel;J Athl Train,2007
4. Survey of sport participation and sport injury in Calgary and area high schools;Emery;Clin J Sports Med,2006
5. Identification and management of children with sport-related concussion;Purcell;Paediatr Child Health,2006