Team Sport Risk Exposure Framework-2 (TS-REF-2) to identify sports activities and contacts at increased SARS-CoV-2 transmission risk during the COVID-19 pandemic - Jones, B.; Phillips, G.; Beggs, C.; Calder, J.; Cross, M.; Pearce, N.; Readhead, C.; Smith, J.; Stokes, K. A.; Kemp, S. (British Journal of Sports Medicine, 2021)