1. Harmon KG, Drezner J, Gammons M, et al. American medical society for sports medicine position statement: concussion in sport. Clin J Sport Med. 2013;23:1–18.
2. Concussion Treatment and Management Mayo Clinic Sports Medicine. Available at: https://sportsmedicine.mayoclinic.org/clinical-services/concussion-management.php
. Accessed April 4, 2016.
3. NCAA: Concussion Diagnosis and Management. Best Practices. Available at: http://www.ncaa.org/sport-science-institute/concussion-diagnosis-and-management-best-practices
. Accessed April 5, 2016.
4. Sports Concussion Resources. American Academy of Neurology. Available at: https://www.aan.com/concussion
. Accessed April 7, 2016.
5. Kaminski TW, Wikstrom AM, Gutierrez GM, et al. Purposeful heading during a season does not influence cognitive function or balance in female soccer players. J Clin Exp Neuropsychol. 2007;29:742–751.
6. Babbs CF. Biomechanics of Heading a Soccer ball: Implications for player safety. ScientificWorldJournal. 2001;1:281–322.
7. Is Soccer Bad for Children's Head? Summary of the IOM Workshop on Neuropsychological Consequences of Head Impact in Youth Soccer. Available at: https://www.nap.edu/catalog/10362/is-soccer-bad-for-childrens-heads-summary-of-the-iom
. Accessed April 14, 2016
8. Spiotta AM, Bartsh AJ, Benzel EC. Heading in soccer: dangerous play? Neurosurgery. 2012;70:1–11.
9. Koutures CG, Gregory AJM; the Council on Sports Medicine and Fitness. Heading soccer ball doesn't cause brain damage: study. Pediatrics. 2010;125:410–414.
10. Comstock RD, Currie DW, Pierpoint LA, et al. An evidence-based discussion of heading the ball and concussion in high school soccer. JAMA Pediatr. 2015;169:830–837.
11. Is Soccer Bad for Children's Head?: Summary of the IOM Workshop on Neuropsychological Consequences of Head Impact in Youth Soccer. Washington, DC: National Academy Press; 2002. Available at: http://www.nap.edu/read/10362/chapter/1
. Accessed April 23, 2016.
12. Schneider DK, Grandhi RK, Bansal P, et al. Current state of concussion prevention strategies: a systematic review and meta-analysis of prospective, controlled studies. Br J Sports Med. 2017;51:–.
13. Junge A, Ro[Combining Diaeresis]sch D, Peterson L, et al. Prevention of soccer injuries: a prospective intervention study in youth amateur players. Am J Sports Med. 2002;30:652–659.
14. NSCAA. Coaching Fundamentals, Section 5: Basic Skills—Heading and Tackling. Available at: http://ww2.nscaa.com/education/resources/fundamentals/basic-skills-heading-tackling
. Accessed May 5, 2016.
15. FIFA Soccer Ball Testing and Approvals. Available at: http://www.soccerballworld.com/FIFA_Approvals.htm
. Accessed May 6, 2016.
16. Stevens ST, Lassonde M, de Beaumont L, et al. In-game fatigue influences concussions in national hockey league players. Res Sports Med. 2008;16:68–74.
17. AMSSM. News RELEASE- AMSSM Statement Regarding Release of New Film, Concussion. American Medical Society for Sport Medicine. Available at: https://www.amssm.org/News-Release-Article.php?NewsID=182
. Accessed May 7, 2016.