On-ice and off-ice fitness profiles of elite and u20 male ice hockey players of two different national standards - Vigh-Larsen, J. F.; Haverinen, M. T.; Panduro, J.; Ermidis, G.; Andersen, T. B.; Overgaard, K.; Krustrup, P.; Parkkari, J.; Avela, J.; Kyröläinen, H.; Mohr, M. (The Journal of Strength and Conditioning Research, 2020)