Consensus statement on concussion in sport: the 4th International Conference on Concussion in Sport held in Zurich, November 2012. Issue 5 (11th March 2013) - McCrory, Paul; Meeuwisse, Willem H; Aubry, Mark; Cantu, Bob; Dvořák, Jiří; Echemendia, Ruben J; Engebretsen, Lars; Johnston, Karen; Kutcher, Jeffrey S; Raftery, Martin; Sills, Allen; Benson, Brian W; et al.