1. Department of Biomedical, Dental, Morphological and Functional Imaging Sciences (BIOMORF), University of Messina, Pugliatti Square 1, 98122 Messina, Italy
2. Faculty of Science, Centre for Inflammation, Centenary Institute, University of Technology, Ultimo, Sydney, Australia
3. Division of Pneumology, Cyto- Immunopathology Laboratory of the Cardio-Respiratory System, Clinical Scientific Institutes Maugeri IRCCS, Veruno, Italy
4. Department of Medicine, Surgery and Dentistry, Salerno Medical School, University of Salerno, Salerno, Italy
5. Airway Disease Section, National Heart and Lung Institute, Imperial College, London, United Kingdom