1. Vall d’Hebron Institute of Research (VHIR) - Respiratory Disease Department, Hospital Universitari Vall d’Hebron (HUVH) Passeig Vall d’Hebron, 119–129, Barcelona, Spain
2. Respiratory Diseases, Vall d’Hebron University Hospital, Barcelona, Catalunya, Spain
3. Department of Medicine and Surgery, Respiratory Diseases, Università dell’Insubria, Varese, Italy