1 Regional Referral Centre for Rare Lung Disease, Azienda Ospedaliero-Universitaria Policlinico G. Rodolico-San Marco, University of Catania, Catania, Italy.
2 Artroreuma S.R.L., Rheumatology Outpatient Clinic, Catania, Italy.
3 Department of Medical, Surgical Sciences and Advanced Technologies G.F. Ingrassia, Radiology I Unit, University Hospital Policlinico G. Rodolico-San Marco, Catania, Italy.
4 Respiratory Diseases Unit, San Gerardo Hospital, Monza University of Milano-Bicocca, Milan, Italy.