1. Research Centre on Asthma and COPD; Department of Clinical and Experimental Medicine; University of Ferrara; Ferrara; Italy
2. Department of Medicine; Duke University Medical Center; Durham; NC; USA
3. Meakins-Christie Laboratories; McGill University; Montreal; Québec; Canada
4. Department of Respiratory Medicine; Montpellier University; Montpellier; France
5. Hospital Grosshansdorf; Center for Pneumology and Thoracic Surgery; Woehrendamm; Grosshansdorf; Germany
6. Department of Respiratory Diseases; University of Modena and Reggio Emilia; Modena; Italy