Mental health, physical activity, and quality of life of US adolescent athletes during COVID-19-related school closures and sport cancellations: A study of 13 000 athletes - McGuine, T. A.; Biese, K. M.; Petrovska, L.; Hetzel, S. J.; Reardon, C.; Kliethermes, S.; Bell, D. R.; Brooks, A.; Watson, A. M. (Journal of Athletic Training, 2021)