1 Department of Rheumatology, Gaetano Pini Hospital, Milan, Italy. Electronic address: Nicoletta.DelPapa@asst-pini-cto.it.
2 Regional Referral Center for Rare Lung Diseases, Department of Clinical and Experimental Medicine, University of Catania, Italy.
3 Department of Rheumatology, Gaetano Pini Hospital, Milan, Italy.
4 Department of Rheumatology, Gaetano Pini Hospital, Milan, Italy; University of Milan, Dept. of Clinical Sciences and Community Health, Research Center for Adult and Pediatric Rheumatic Diseases, Milan, Italy.