1 Respiratory Unit, School of Medicine and Surgery, Università degli Studi di Milano Bicocca, San Gerardo Hospital, ASST di Monza, Monza, Italy. Electronic address: paola.faverio@unimib.it.
2 National Centre for Healthcare Research & Pharmacoepidemiology, University of Milano-Bicocca, Milan, Italy; Laboratory of Healthcare Research & Pharmacoepidemiology, Unit of Biostatistics, Epidemiology and Public Health, Department of Statistics and Quantitative Methods, University of Milano-Bicocca, Milan, Italy.
3 Pulmonology Unit, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy.
4 Respiratory Unit, School of Medicine and Surgery, Università degli Studi di Milano Bicocca, San Gerardo Hospital, ASST di Monza, Monza, Italy.
5 Department of Biomedical Sciences and Public Health, Universitá Politecnica delle Marche-Respiratory Diseases Unit, Azienda Ospedaliero-Universitaria Ospedali Riuniti, Ancona, Italy.