Recurrent concussion in retired rugby union players is associated with cerebral hypoperfusion and cognitive impairment. - Owens, T. S.; Calverley, T. A.; Stacey, B. S.; Marley, C.; Tsukamoto, H.; Steggall, M.; Jones, G.; Fall, L.; Venables, L.; Davies, B.; Williams, P.; Bailey, D. (Proceedings of the Physiological Society, 2019)