COVID-19: Analysis of cavitary air inspired through a mask, in competitive adolescent athletes - de Yzaguirre Maura, I.; Terricabras Genís, J.; Dulanto Zabala, D.; Monaco, M.; Santiago Garcia, J.; Rupérez Vielba, F.; Vives i Turcó, J.; Grazioli, G. (Apunts Sports Medicine, 2021)