Stress and coping during the COVID-19 pandemic among martial arts athletes - a cross-cultural study - Makarowski, R.; Piotrowski, A.; Predoiu, R.; Görner, K.; Predoiu, A.; Mitrache, G.; Malinauskas, R.; Bochaver, K.; Dovzhik, L.; Cherepov, E.; Vazne, Z.; Vicente-Salar, N.; et al. (Archives of Budo, 2020)