1. Department of Respiratory Medicine, Hospital Universitari Germans Trias i Pujol, Badalona, Spain
2. Universitat Autònoma de Barcelona (UAB), Department of Medicine. Barcelona, Spain
3. Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBERES), Madrid, Spain
4. Universitat Politécnica de Catalunya (UPC), Barcelona, Spain
5. Smart Vision Technologies, S.L, Barcelona, Spain
6. Pneumology Department, University Hospital Vall d'Hebron. Barcelona, Spain