1. Basque Center for Applied Mathematics (BCAM), Bilbao, Spain
2. School of Science and Technology, IE University, Madrid, Spain
3. Respiratory Service, Galdakao-Usansolo University Hospital, Galdakao, Spain
4. Department of Applied Statistics and Operational Research, and Quality, Universitat Politècnica de València, Valencia, Spain
5. Departamento de Tecnología Electrónica, University of the Basque Country (UPV/EHU), Vitoria-Gasteiz, Spain
6. BioCruces Bizkaia Health Research Institute, Barakaldo, Spain
7. Research Unit, Galdakao-Usansolo University Hospital, Galdakao, Spain
8. Pneumology Department, La Fe University and Polytechnic Hospital, Valencia, Spain
9. Pneumology Department, Hospital Clínic Barcelona, Barcelona, Spain
10. Pneumology Service, Cruces University Hospital, Barakaldo, Spain