High efficiency particulate air filters and heat & moisture exchanger filters increase positive end-expiratory pressure in helmet continuous positive airway pressure: A bench-top study E. Rezoagli, G. Coppola, L. Dezza, A. Galesi, G.P. Gallo, R. Fumagalli, G. Bellani, G. Foti, A. Lucchini

Effectiveness and safety of a new helmet CPAP configuration allowing tidal volume monitoring in patients with COVID-19 C. Chiappero, G. Misseri, A. Mattei, M. Ippolito, C. Albera, E. Pivetta, A. Cortegiani, C. Gregoretti

Use of Helmet CPAP in COVID-19 – A practical review H. Amirfarzan, M. Cereda, T.G. Gaulton, K.B. Leissner, A. Cortegiani, R. Schumann, C. Gregoretti