Recommendations for exercise testing in sports medicine during the current pandemic situation (SARS-CoV-2 / COVID-19) - Nieß, A. M.; Bloch, W.; Friedman-Bette, B.; Grim, C.; Gärtner, B.; Halle, M.; Hirschmüller, A.; Kopp, C.; Meyer, T.; Niebauer, J.; Predel, G.; Reinsberger, C.; et al. (Deutsche Zeitschrift für Sportmedizin, 2020)