1 Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy.
2 Pulmonology Unit, ASST Spedali Civili, Brescia, Italy; Department of Clinical and Experimental Sciences, Università degli Studi di Brescia, Brescia, Italy. Electronic address: guido.levi@asst-spedalicivili.it.
3 Department of Public Health and Infectious Diseases, Sapienza University of Rome, Rome, Italy; Pulmonary Critical Care Unit, Policlinico Umberto I Hospital, Rome, Italy.
4 Department of Basic Medical Science Neuroscience and Sensory Organs, University of Bari, Bari, Italy.
5 Pulmonology Unit, ASST Spedali Civili, Brescia, Italy.