1. Emergency department visits for sports and recreation–related traumatic brain injuries among children—United States, 2010–2016.;Sarmiento;MMWR Morb Mortal Wkly Rep,2019
2. Consensus statement on concussion in sport—the 5th international conference on concussion in sport held in Berlin, October 2016.;McCrory;Br J Sports Med,2017
3. The Aspen Institute. State of play 2018–trends and developments. Washington, DC: The Aspen Institute; 2018. https://assets.aspeninstitute.org/content/uploads/2018/10/StateofPlay2018_v4WEB_2-FINAL.pdf
4. Comprehensive coach education and practice contact restriction guidelines result in lower injury rates in youth American football.;Kerr;Orthop J Sports Med,2015
5. Moses S. Sports contact levels. Minneapolis-St. Paul, MN: Family Practice Notebook; 2018. https://fpnotebook.com/sports/Exam/SprtsCntctLvls.htm