COVID-19 Acute Respiratory Distress Syndrome: Treatment with Helmet CPAP in Respiratory Intermediate Care Unit by Pulmonologists in the Three Italian Pandemic Waves oleh Martina Piluso, Clarissa Ferrari, Silvia Pagani, Pierfranco Usai, Stefania Raschi, Luca Parachini, Elisa Oggionni, Chiara Melacini, Francesca D’Arcangelo, Roberta Cattaneo, Cristiano Bonacina, Monica Bernareggi, Serena Bencini, Marta Nadalin, Mara Borelli, Roberto Bellini, Maria Chiara Salandini, Paolo Scarpazza