Callaghan, MJ, Hughes, T, Davin, J, Hayes, R, Hough, N, Torpey, D, Perry, D, Dawson, S, Murray, E, Jones, R, "Effect of a cervical collar on head and neck acceleration profiles during emergency spinal immobilisation and extrication procedures in elite football (soccer) players : protocol for a randomised, controlled cross-over trial", BMJ Open Sport & Exercise Medicine, 2021