McCrory P, Meeuwisse W, Dvořák J, et al. Consensus statement on concussion in sport—the 5th international conference on concussion in sport held in Berlin, October 2016. Br J Sports Med. 2017;51:838–47.
Harmon KG, Drezner JA, Gammons M, Guskiewicz KM, Halstead M, Herring SA, et al. American Medical Society for Sports Medicine position statement: concussion in sport. Br J Sports Med. 2013;47(1):15–26.
Reynolds G. A single concussion may have lasting impact. New York Times. 2016.
King D, Brughelli M, Hume P, Gissane C. Assessment, management and knowledge of sport-related concussion: systematic review. Sports Med. 2014;44(4):449–71.
Ellemberg D, Henry LC, Macciocchi SN, Guskiewicz KM, Broglio SP. Advances in sport concussion assessment: from behavioral to brain imaging measures. J Neurotrauma. 2009;26(12):2365–82.
Tator CH, Davis HS, Dufort PA, Tartaglia MC, Davis KD, Ebraheem A, et al. Postconcussion syndrome: demographics and predictors in 221 patients. J Neurosurg. 2016;125(5):1206–16.
McKee AC, Stern RA, Nowinski CJ, Stein TD, Alvarez VE, Daneshvar DH, et al. The spectrum of disease in chronic traumatic encephalopathy. Brain. 2013;136(Pt 1):43–64.
Omalu BI, Hamilton RL, Kamboh MI, DeKosky ST, Bailes J. Chronic traumatic encephalopathy (CTE) in a National Football League Player: Case report and emerging medicolegal practice questions. J Forensic Nurs. 2010;6(1):40–6.
McKee AC, Cantu RC, Nowinski CJ, Hedley-Whyte ET, Gavett BE, Budson AE, et al. Chronic traumatic encephalopathy in athletes: progressive tauopathy after repetitive head injury. J Neuropathol Exp Neurol. 2009;68(7):709–35.
Lehman EJ, Hein MJ, Baron SL, Gersic CM. Neurodegenerative causes of death among retired National Football League players. Neurology. 2012;79(19):1970–4.
Guskiewicz KM, Marshall SW, Bailes J, McCrea M, Cantu RC, Randolph C, et al. Association between recurrent concussion and late-life cognitive impairment in retired professional football players. Neurosurgery. 2005;57(4):719–26.
Guskiewicz KM, Marshall SW, Bailes J, McCrea M, Harding HP Jr, Matthews A, et al. Recurrent concussion and risk of depression in retired professional football players. Med Sci Sports Exerc. 2007;39(6):903–9.
McCrory P, Meeuwisse WH, Kutcher JS, Jordan BD, Gardner A. What is the evidence for chronic concussion-related changes in retired athletes: behavioural, pathological and clinical outcomes? Br J Sports Med. 2013;47(5):327–30.
Schwarz A, Bogdanich W, Williams J. N.F.L.’s flawed concussion research and ties to tobacco industry. New York Times. 2016.
Sports Legacy Institute. Safer soccer initiative. Available from: http://www.sportslegacy.org/policy/safer-soccer/. Accessed 11 Nov 2016.
National Federation of State High School Associations. 2014–15 High School Athletics Participation Survey. Available from: http://www.nfhs.org/ParticipationStatics/. Accessed 29 Nov 2016.
Abrahams S, Mc Fie S, Patricios J, Posthumus M, September AV. Risk factors for sports concussion: an evidence-based systematic review. Br J Sports Med. 2014;48(2):91–7.
Delaney JSM, Lacroix VJM, Leclerc SMD, Johnston KMMDP. Concussions among university football and soccer players. Clin J Sport Med. 2002;12(6):331–8.
Fuller CW, Junge A, Dvorak J. A six year prospective study of the incidence and causes of head and neck injuries in international football. Br J Sports Med. 2005;39(Suppl 1):i3–9.
Lincoln AE, Caswell SV, Almquist JL, Dunn RE, Norris JB, Hinton RY. Trends in concussion incidence in high school sports: a prospective 11-year study. Am J Sports Med. 2011;39(5):958–63.
Kerr HA, Curtis C, Micheli LJ, Kocher MS, Zurakowski D, Kemp SP, et al. Collegiate rugby union injury patterns in New England: a prospective cohort study. Br J Sports Med. 2008;42(7):595–603.
Emery CA, Meeuwisse WH, McAllister JR. Survey of sport participation and sport injury in Calgary and area high schools. Clin J Sport Med. 2006;16(1):20–6.
Maher ME, Hutchison M, Cusimano M, Comper P, Schweizer TA. Concussions and heading in soccer: a review of the evidence of incidence, mechanisms, biomarkers and neurocognitive outcomes. Brain Inj. 2014;28(3):271–85.
Koh JO, Cassidy JD, Watkinson EJ. Incidence of concussion in contact sports: a systematic review of the evidence. Brain Inj. 2003;17(10):901–17.
Meehan WP III, Mannix RC, O’Brien MJ, Collins MW. The prevalence of undiagnosed concussions in athletes. Clin J Sport Med. 2013;23(5):339–42.
McCrea M, Hammeke T, Olsen G, Leo P, Guskiewicz K. Unreported concussion in high school football players: implications for prevention. Clin J Sport Med. 2004;14(1):13–7.
McCrory P, Feddermann-Demont N, Dvořák J, Cassidy JD, McIntosh A, Vos PE, et al. What is the definition of sports-related concussion: a systematic review. Br J Sports Med. 2017;51(11):877–87.
Patricios J, Fuller GW, Ellenbogen R, Herring S, Kutcher JS, Loosemore M, et al. What are the critical elements of sideline screening that can be used to establish the diagnosis of concussion? A systematic review. Br J Sports Med. 2017;51(11):888–94.
van der Windt DA, Thomas E, Pope DP, de Winter AF, Macfarlane GJ, Bouter LM, et al. Occupational risk factors for shoulder pain: a systematic review. Occup Environ Medi. 2000;57(7):433–42.
Neyeloff JL, Fuchs SC, Moreira LB. Meta-analyses and Forest plots using a microsoft excel spreadsheet: step-by-step guide focusing on descriptive data analysis. BMC Res Notes. 2012;5(1):52.
Stroup DF, Berlin JA, Morton SC, Olkin I, Williamson GD, Rennie D, et al. Meta-analysis of observational studies in epidemiology: a proposal for reporting. JAMA. 2000;283(15):2008–12.
Agel J, Evans TA, Dick R, Putukian M, Marshall SW. Descriptive epidemiology of collegiate men’s soccer injuries: National Collegiate Athletic Association Injury Surveillance System, 1988–1989 through 2002–2003. J Athl Train. 2007;42(2):270–7.
Akodu AK, Owoeye OB, Ajenifuja M, Akinbo SR, Olatona F, Ogunkunle O. Incidence and characteristics of injuries during the 2011 West Africa Football Union (WAFU) Nations’ Cup. Afr J Med Med Sci. 2012;41(4):423–8.
Andersen TE, Arnason A, Engebretsen L, Bahr R. Mechanisms of head injuries in elite football. Br J Sports Med. 2004;38(6):690–6.
Bjorneboe J, Bahr R, Dvorak J, Andersen TE. Lower incidence of arm-to-head contact incidents with stricter interpretation of the Laws of the Game in Norwegian male professional football. Br J Sports Med. 2013;47(8):508–14.
Dick R, Putukian M, Agel J, Evans TA, Marshall SW. Descriptive epidemiology of collegiate women’s soccer injuries: National Collegiate Athletic Association Injury Surveillance System, 1988–1989 through 2002–2003. J Athl Train. 2007;42(2):278–85.
Dupont G, Nedelec M, McCall A, McCormack D, Berthoin S, Wisloff U. Effect of 2 soccer matches in a week on physical performance and injury rate. Am J Sports Med. 2010;38(9):1752–8.
Dvorak J, Junge A, Derman W, Schwellnus M. Injuries and illnesses of football players during the 2010 FIFA World Cup. Br J Sports Med. 2011;45(8):626–30.
Dvorak J, Junge A, Grimm K, Kirkendall D. Medical report from the 2006 FIFA World Cup Germany. Br J Sports Med. 2007;41(9):578–81.
Eirale C, Farooq A, Smiley FA, Tol JL, Chalabi H. Epidemiology of football injuries in Asia: a prospective study in Qatar. J Sci Med Sport. 2013;16(2):113–7.
Eirale C, Tol JL, Whiteley R, Chalabi H, Holmich P. Different injury pattern in goalkeepers compared to field players: a three-year epidemiological study of professional football. J Sci Med Sport. 2014;17(1):34–8.
Ekstrand J, Hagglund M, Fuller CW. Comparison of injuries sustained on artificial turf and grass by male and female elite football players. Scand J Med Sci Sports. 2011;21(6):824–32.
Ekstrand J, Hagglund M, Walden M. Injury incidence and injury patterns in professional football: the UEFA injury study. Br J Sports Med. 2011;45(7):553–8.
Fuller CW, Dick RW, Corlette J, Schmalz R. Comparison of the incidence, nature and cause of injuries sustained on grass and new generation artificial turf by male and female football players. Part 2: training injuries. Br J Sports Med. 2007;41(Suppl 1):i27–32.
Fuller CW, Dick RW, Corlette J, Schmalz R. Comparison of the incidence, nature and cause of injuries sustained on grass and new generation artificial turf by male and female football players. Part 1: match injuries. Br J Sports Med. 2007;41(Suppl 1):i20–6.
Gaulrapp H, Becker A, Walther M, Hess H. Injuries in women’s soccer: a 1-year all players prospective field study of the women’s Bundesliga (German premier league). Clin J Sport Med. 2010;20(4):264–71.
Giza E, Mithofer K, Farrell L, Zarins B, Gill T. Injuries in women’s professional soccer. Br J Sports Med. 2005;39(4):212–6.
Hagglund M, Walden M, Ekstrand J. Injuries among male and female elite football players. Scand J Med Sci Sports. 2009;19(6):819–27.
Hassabi M, Mohammad-Javad Mortazavi S, Giti MR, Hassabi M, Mansournia MA, Shapouran S. Injury profile of a professional soccer team in the premier league of Iran. Asian J Sports Med. 2010;1(4):201–8.
Jacobson I, Tegner Y. Injuries among Swedish female elite football players: a prospective population study. Scand J Med Sci Sports. 2007;17(1):84–91.
Junge A, Dvorak J. Injuries in female football players in top-level international tournaments. Br J Sports Med. 2007;41(Suppl 1):i3–7.
Junge A, Dvorak J. Football injuries during the 2014 FIFA World Cup. Br J Sports Med. 2015;49(9):599–602.
Junge A, Dvorak J, Graf-Baumann T. Football injuries during the World Cup 2002. Am J Sports Med. 2004;32(1 Suppl):23s–7s.
Junge A, Dvorak J, Graf-Baumann T, Peterson L. Football injuries during FIFA tournaments and the Olympic Games, 1998–2001: development and implementation of an injury-reporting system. Am J Sports Med. 2004;32(1 Suppl):80s–9s.
Meyers MC. Incidence, mechanisms, and severity of match-related collegiate women’s soccer injuries on FieldTurf and natural grass surfaces: a 5-year prospective study. Am J Sports Med. 2013;41(10):2409–20.
Nilsson M, Hagglund M, Ekstrand J, Walden M. Head and neck injuries in professional soccer. Clin J Sport Med. 2013;23(4):255–60.
Owen AL, Forsyth JJ, Wong DP, Dellal A, Connelly S, Chamari K. Heart rate’ based training intensity and its impact on injury incidence amongst elite level professional soccer players. J Strength Cond Res. 2015;29(6):1705–12.
Walden M, Hagglund M, Ekstrand J. UEFA Champions League study: a prospective study of injuries in professional football during the 2001–2002 season. Br J Sports Med. 2005;39(8):542–6.
Yoon YS, Chai M, Shin DW. Football injuries at Asian tournaments. Am J Sports Med. 2004;32(1 Suppl):36s–42s.
Agel J, Dick R, Nelson B, Marshall SW, Dompier TP. Descriptive epidemiology of collegiate women’s ice hockey injuries: National Collegiate Athletic Association Injury Surveillance System, 2000–2001 through 2003–2004. J Athl Train. 2007;42(2):249–54.
Agel J, Dompier TP, Dick R, Marshall SW. Descriptive epidemiology of collegiate men’s ice hockey injuries: National Collegiate Athletic Association Injury Surveillance System, 1988–1989 through 2003–2004. J Athl Train. 2007;42(2):241–8.
Agel J, Harvey EJ. A 7-year review of men’s and women’s ice hockey injuries in the NCAA. Can J Surg. 2010;53(5):319–23.
Benson BW, Meeuwisse WH, Rizos J, Kang J, Burke CJ. A prospective study of concussions among National Hockey League players during regular season games: the NHL-NHLPA Concussion Program. CMAJ. 2011;183(8):905–11.
Benson BW, Rose MS, Meeuwisse WH. The impact of face shield use on concussions in ice hockey: a multivariate analysis. Br J Sports Med. 2002;36(1):27–32.
Echlin PS, Skopelja EN, Worsley R, Dadachanji SB, Lloyd-Smith DR, Taunton JA, et al. A prospective study of physician-observed concussion during a varsity university ice hockey season: incidence and neuropsychological changes. Part 2 of 4. Neurosurg Focus. 2012;33(6):E2: 1–11.
Flik K, Lyman S, Marx RG. American collegiate men’s ice hockey: an analysis of injuries. Am J Sports Med. 2005;33(2):183–7.
Grant JA, Bedi A, Kurz J, Bancroft R, Gagnier JJ, Miller BS. Ability of preseason body composition and physical fitness to predict the risk of injury in male collegiate hockey players. Sports Health. 2015;7(1):45–51.
Hutchison MG, Comper P, Meeuwisse WH, Echemendia RJ. A systematic video analysis of National Hockey League (NHL) concussions, part I: who, when, where and what? Br J Sports Med. 2015;49(8):547–51.
Kuzuhara K, Shimamoto H, Mase Y. Ice hockey injuries in a Japanese elite team: a 3-year prospective study. J Athl Train. 2009;44(2):208–14.
Rishiraj N, Lloyd-Smith R, Lorenz T, Niven B, Michel M. University men’s ice hockey: rates and risk of injuries over 6-years. J Sports Med Phys Fit. 2009;49(2):159–66.
Schick DM, Meeuwisse WH. Injury rates and profiles in female ice hockey players. Am J Sports Med. 2003;31(1):47–52.
Tuominen M, Stuart MJ, Aubry M, Kannus P, Parkkari J. Injuries in men’s international ice hockey: a 7-year study of the International Ice Hockey Federation Adult World Championship Tournaments and Olympic Winter Games. Br J Sports Med. 2015;49(1):30–6.
Tuominen M, Stuart MJ, Aubry M, Kannus P, Tokola K, Parkkari J. Injuries in women’s international ice hockey: an 8-year study of the World Championship tournaments and Olympic Winter Games. Br J Sports Med. 2016;50(22):1406–12.
Booher MA, Wisniewski J, Smith BW, Sigurdsson A. Comparison of reporting systems to determine concussion incidence in NCAA Division I collegiate football. Clin J Sport Med. 2003;13(2):93–5.
Dick R, Ferrara MS, Agel J, Courson R, Marshall SW, Hanley MJ, et al. Descriptive epidemiology of collegiate men’s football injuries: National Collegiate Athletic Association Injury Surveillance System, 1988–1989 through 2003–2004. J Athl Train. 2007;42(2):221–33.
Dompier TP, Kerr ZY, Marshall SW, Hainline B, Snook EM, Hayden R, et al. Incidence of concussion during practice and games in youth, high school, and collegiate American Football players. JAMA Pediatr. 2015;169(7):659–65.
Feeley BT, Kennelly S, Barnes RP, Muller MS, Kelly BT, Rodeo SA, et al. Epidemiology of National Football League training camp injuries from 1998 to 2007. Am J Sports Med. 2008;36(8):1597–603.
Funk JR, Rowson S, Daniel RW, Duma SM. Validation of concussion risk curves for collegiate football players derived from HITS data. Ann Biomed Eng. 2012;40(1):79–89.
Guskiewicz KM, McCrea M, Marshall SW, Cantu RC, Randolph C, Barr W, et al. Cumulative effects associated with recurrent concussion in collegiate football players: the NCAA Concussion Study. JAMA. 2003;290(19):2549–55.
Guskiewicz KM, Weaver NL, Padua DA, Garrett WE Jr. Epidemiology of concussion in collegiate and high school football players. Am J Sports Med. 2000;28(5):643–50.
Hootman JM, Dick R, Agel J. Epidemiology of collegiate injuries for 15 sports: summary and recommendations for injury prevention initiatives. J Athl Train. 2007;42(2):311–9.
Iguchi J, Yamada Y, Kimura M, Fujisawa Y, Hojo T, Kuzuhara K, et al. Injuries in a Japanese Division I collegiate American Football team: a 3-season prospective study. J Athl Train. 2013;48(6):818–25.
Kerr ZY, Hayden R, Dompier TP, Cohen R. Association of equipment worn and concussion injury rates in National Collegiate Athletic Association football practices: 2004–2005 to 2008–2009 academic years. Am J Sports Med. 2015;43(5):1134–41.
Kilcoyne KG, Dickens JF, Svoboda SJ, Owens BD, Cameron KL, Sullivan RT, et al. Reported concussion rates for three Division I football programs: an evaluation of the new NCAA concussion policy. Sports Health. 2014;6(5):402–5.
Lynall RC, Kerr ZY, Parr MS, Hackney AC, Mihalik JP. Division I college football concussion rates are higher at higher altitudes. J Orthop Sports Phys Ther. 2016;46(2):96–103.
Meeuwisse WH, Hagel BE, Mohtadi NG, Butterwick DJ, Fick GH. The distribution of injuries in men’s Canada West university football. A 5-year analysis. Am J Sports Med. 2000;28(4):516–23.
Zemper ED. Two-year prospective study of relative risk of a second cerebral concussion. Am J Phys Med Rehabil. 2003;82(9):653–9.
Best JP, McIntosh AS, Savage TN. Rugby World Cup 2003 injury surveillance project. Br J Sports Med. 2005;39(11):812–7.
Brooks JH, Fuller CW, Kemp SP, Reddin DB. A prospective study of injuries and training amongst the England 2003 Rugby World Cup squad. Br J Sports Med. 2005;39(5):288–93.
Cross M, Kemp S, Smith A, Trewartha G, Stokes K. Professional Rugby Union players have a 60% greater risk of time loss injury after concussion: a 2-season prospective study of clinical outcomes. Br J Sports Med. 2016;50(15):926–31.
Fuller CW, Laborde F, Leather RJ, Molloy MG. International Rugby Board Rugby World Cup 2007 injury surveillance study. Br J Sports Med. 2008;42(6):452–9.
Fuller CW, Sheerin K, Targett S. Rugby World Cup 2011: International Rugby Board injury surveillance study. Br J Sports Med. 2013;47(18):1184–91.
Fuller CW, Taylor A, Raftery M. Epidemiology of concussion in men’s elite Rugby-7s (Sevens World Series) and Rugby-15s (Rugby World Cup, Junior World Championship and Rugby Trophy, Pacific Nations Cup and English Premiership). Br J Sports Med. 2015;49(7):478–83.
Holtzhausen LJ, Schwellnus MP, Jakoet I, Pretorius AL. The incidence and nature of injuries in South African rugby players in the rugby Super 12 competition. S Afr Med J. 2006;96(12):1260–5.
Kemp SP, Hudson Z, Brooks JH, Fuller CW. The epidemiology of head injuries in English professional rugby union. Clin J Sport Med. 2008;18(3):227–34.
Moore IS, Ranson C, Mathema P. Injury risk in international rugby union: three-year injury surveillance of the Welsh National Team. Orthop J Sports Med. 2015;3(7):2325967115596194.
Peck KY, Johnston DA, Owens BD, Cameron KL. The incidence of injury among male and female intercollegiate rugby players. Sports Health. 2013;5(4):327–33.
Schick DM, Molloy MG, Wiley JP. Injuries during the 2006 Women’s Rugby World Cup. Br J Sports Med. 2008;42(6):447–51.
Willigenburg NW, Borchers JR, Quincy R, Kaeding CC, Hewett TE. Comparison of injuries in American collegiate Football and club rugby: a prospective cohort study. Am J Sports Med. 2016;44(3):753–60.
Zuckerman SL, Kerr ZY, Yengo-Kahn A, Wasserman E, Covassin T, Solomon GS. Epidemiology of sports-related concussion in NCAA athletes from 2009–2010 to 2013–2014: incidence, recurrence, and mechanisms. Am J Sports Med. 2015;43(11):2654–62.
Fuller CW, Ekstrand J, Junge A, Andersen TE, Bahr R, Dvorak J, et al. Consensus statement on injury definitions and data collection procedures in studies of football (soccer) injuries. Scand J Med Sci Sports. 2006;16(2):83–92.
Fuller CW, Molloy MG, Bagate C, Bahr R, Brooks JHM, Donson H, et al. Consensus statement on injury definitions and data collection procedures for studies of injuries in rugby union. Br J Sports Med. 2007;41(5):328–31.
Tierney RT, Higgins M, Caswell SV, Brady J, McHardy K, Driban JB, et al. Sex differences in head acceleration during heading while wearing soccer headgear. J Athl Train. 2008;43(6):578–84 (7p).
Barnes BC, Cooper L, Kirkendall DT, McDermott TP, Jordan BD, Garrett WE Jr. Concussion history in elite male and female soccer players. Am J Sports Med. 1998;26(3):433–8.
Dick R. Is there a gender difference in concussion incidence and outcomes? Br J Sports Med. 2009;43(Suppl 1):i46–50.
Gardner AJ, Iverson GL, Williams WH, Baker S, Stanwell P. A systematic review and meta-analysis of concussion in rugby union. Sports Med. 2014;44(12):1717–31.