1 Alma Mater Studiorum University of Bologna, Department of Clinical, Integrated and Experimental Medicine (DIMES), Bologna, Italy; IRCCS Azienda Ospedaliero Universitaria di Bologna, University Hospital Sant'Orsola-Malpighi - Respiratory and Critical Care Unit, Bologna, Italy.
2 Department of Public Health and Infectious Disease, Sapienza University of Rome - Italy. Pulmonology, Respiratory and Critical Care Unit, Policlinico Umberto I Hospital, Rome, Italy.