Siempos, I.I. Xourgia, E. Ntaidou, T.K. Zervakis, D. Magira, E.E. Kotanidou, A. Routsi, C. Zakynthinos, S.G., Effect of Early vs. Delayed or No Intubation on Clinical Outcomes of Patients With COVID-19: An Observational Study, Frontiers in Cardiovascular Medicine, (7), 2020, Frontiers Media S.A,