5 Rheumatology Section, Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties, University of Palermo, Piazza delle Cliniche 2, 90110, Palermo, Italy. 6 Respiratory Diseases Unit, Department of Medical and Surgical Sciences and Neurosciences, University of Siena, Viale Bracci 1, 53100, Siena, Italy.
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