Extracorporeal Membrane Oxygenation in Critically Ill COVID-19 Patients and Predictors of Mortality: The Aachen Experience - Zayat, R.; Kalverkamp, S.; Grottke, O.; Durak, K.; Dreher, M.; Marx, N.; Marx, G.; Spillner, J.; Kersten, A.; Autschbach, R. (The Thoracic and Cardiovascular Surgeon, 2021)