Concussion – ‘Something is broken in the game of rugby’

Other than being elite-level rugby players, what do Ben Smith, Conor Murray, Bernard Foley, Alexis Palisson, Sekope Kepu, Stuart Hogg, Nic Stirzaker, George North, Charlie Ngatai, Tommy Seymour, Colin Slade, James Parsons, and Ryan Wilson have in common?