Rafferty, J., Ranson, C., Oatley, G., Mostafa, M., Mathema, P., Crick, T., & Moore, I. S. (2019). On average, a professional rugby union player is more likely than not to sustain a concussion after 25 matches. British Journal of Sports Medicine, pp. bjsports-2017-098417. doi:10.1136/bjsports-2017-098417

Rafferty, Jim, Craig Ranson, Giles Oatley, Mohamed Mostafa, Prabhat Mathema, Tom Crick, and Isabel S. Moore. "On Average, a Professional Rugby Union Player Is More Likely Than Not to Sustain a Concussion After 25 Matches." British Journal of Sports Medicine 2019: bjsports-2017-098417.

Rafferty, Jim, et al. "On Average, a Professional Rugby Union Player Is More Likely Than Not to Sustain a Concussion After 25 Matches." British Journal of Sports Medicine 2019: bjsports-2017-098417.