1. https://en.oxforddictionaries.com/definition/robust (accessed 6 Jun 2017)
2. http://www.qmul.ac.uk/media/news/items/smd/171584.html (accessed 6 Jun 2017)
3. What are the critical elements of sideline screening that can be used to establish the diagnosis of concussion? A systematic review;Patricios;Br J Sports Med,2017
4. http://www.foxnews.com/health/2017/02/03/heading-in-soccer-may-lead-to-concussion-symptoms.htmlAcceesed (accessed 6 Jun 2016)