1. Biomedical Department of Internal and Specialistic Medicine (DIBIMIS); Section of Pneumology; University of Palermo; Palermo Italy
2. Institute of Biomedicine and Molecular Immunology (IBIM); National Research Council (CNR); Palermo Italy
3. Sleep Apnea Unit; Hospital Santa Maria; Lleida Spain
4. Hospital Universitari son Espases; Palma de Mallorca Spain
5. Respiratory Department; Hospital Universitario Arnau de Vilanova; Lleida Spain
6. CIBERes; Madrid Spain