Groffik D, Frömel K, Witek-Chabińska M, Szyja R, Žatka R, Urbański B. Daily and school physical activity of 16 year-old girls and boys. Health Prom Phys Act [Internet]. 2019 Jan. 21 [cited 2024 Nov. 21];4(3):12-9. Available from: https://journals.anstar.edu.pl/index.php/hppa/article/view/110