Received: 28 March 2018
Accepted: 7 May 2018
First Online: 24 May 2018
Change Date: 7 December 2018
Change Type: Correction
Change Details: In the original article  reference was made to the Hawk-Eye system having been used as the sideline operating system during the 2015 season.
Ethics Approval and Consent to Participate
: The study was approved by The University of Newcastle’s Human Ethics Committee (reference number: H-2015-0352).
: Andrew Gardner has a clinical practice in neuropsychology involving individuals who have sustained sport-related concussion (including current and former athletes). He has been a contracted concussion consultant to the Rugby Australia since July 2016. He has received travel funding from the Australian Football League (AFL) to present at the Concussion in Football Conference in 2013 and 2017. Previous grant funding includes the NSW Sporting Injuries Committee, the Brain Foundation (Australia), and the Hunter Medical Research Institute (HMRI), supported by Jennie Thomas. He is currently funded through an NHMRC Early Career Fellowship, the HMRI—supported by Anne Greaves, Hunter New England Local Health District, Research, Innovation and Partnerships Health Research & Translation Centre and Clinical Research Fellowship Scheme, and the University of Newcastle’s Priority Research Centre for Stroke and Brain Injury.Warren McDonald is employed as the Chief Medical Officer of Rugby Australia.Ross Tucker is employed by World Rugby, the governing body of the sport of Rugby Union globally.Ryan Kohler and Gordon Fuller declare that they have no competing interests. Michael Makdissi is a consultant Sport and Exercise Medicine physician at Olympic Park Sports Medicine Centre (Melbourne), team physician for the Hawthorn Football Club (AFL). He is a member of the International Concussion in Sport Group. He receives research funding from the AFL and non-financial research support from CogState Pty Ltd. He has attended meetings organized by the International Olympic Committee (IOC), National Football League (USA), National Rugby League (Australia) and FIFA (Switzerland); however, has not received any payment, research funding, or other monies from these groups other than for travel costs. He is an honorary member of concussion working/advisory groups for AFL, Rugby Australia, Cricket Australia and World Rugby.
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