Definition of sport-related concussion: the 6th International Conference on Concussion in Sport.

Competing Interests: Competing interests: GAD is a member of the Scientific Committee of the 6th International Conference on Concussion in Sport; an honorary member of the AFL Concussion Scientific Committee; Section Editor, Sport and Rehabilitation, Neurosurgery; and has attended meetings organised by sporting organisations including the NFL, NRL, IIHF, IOC and FIFA; however, has not received any payment, research funding or other monies from these groups other than for travel costs. JP: Editor BJSM (honorarium); Member of World Rugby Concussion Advisory Group (unpaid); Independent Concussion Consultant for World Rugby (fee per consultation); Medical consultant to South African Rugby (unpaid); Co-chair of the Scientific Committee, 6th International Conference on Concussion in Sport (unpaid); Board member of the Concussion in Sport Group (unpaid); Scientific Board member, EyeGuideTM (unpaid). KJS has received grant funding from the Canadian Institutes of Health Research, National Football League Scientific Advisory Board, International Olympic Committee Medical and Scientific Research Fund, World Rugby, Mitacs Accelerate, University of Calgary) with funds paid to her institution and not to her personally. She is an associate editor of BJSM (unpaid) and has received travel and accommodation support for meetings where she has presented. She is coordinating the writing of the systematic reviews that will inform the 6th International Consensus on Concussion in Sport, for which she has received an educational grant to assist with the administrative costs associated with the writing of the reviews. She is a member of the AFL Concussion Scientific Committee (unpaid position) and Brain Canada (unpaid positions). She works as a physiotherapy consultant and treats athletes of all levels of sport from grass roots to professional. GLI serves as a scientific advisor for NanoDX, Sway Operations, and Highmark. He has a clinical and consulting practice in forensic neuropsychology, including expert testimony, involving individuals who have sustained mild TBIs (including former athletes), and on the topic of suicide. He has received past research support or funding from several test publishing companies, including ImPACT Applications, CNS Vital Signs and Psychological Assessment Resources (PAR). He receives royalties from the sales of one neuropsychological test (WCST-64). He has received travel support and honorariums for presentations at conferences and meetings. He has received research funding as a principal investigator from the National Football League, and subcontract grant funding as a collaborator from the Harvard Integrated Programme to Protect and Improve the Health of National Football League Players Association Members. He has received research funding from the Wounded Warrior Project. He acknowledges unrestricted philanthropic support from ImPACT Applications, the Mooney-Reed Charitable Foundation, the National Rugby League, Boston Bolts, and the Schoen Adams Research Institute at Spaulding Rehabilitation. NDS: Employee salary from the University of British Columbia; Research grants from the Canadian Institutes of Health Research, Canada Foundation for Innovation, WorkSafeBC, and the US Department of Defense (no salary contributions); Research salary support from the Michael Smith Foundation for Health Research; Editorial board member for Neuropsychology and the Journal of Head Trauma Rehabilitation (unpaid); Chair of the American Congress of Rehabilitation Medicine Mild TBI Task Force (unpaid); Member of the Scientific Advisory Committee, Brain Injury Canada (unpaid); Clinical neuropsychological consulting fees from the National Hockey League, Major League Soccer and NDS (<10% of total income).