2 Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain. marcm@separ.es.
3 Respiratory Medicine, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK.
4 Institute of Applied Health Research, University of Birmingham, Birmingham, UK.
5 Servicio de Neumología. Hospital Álvaro Cunqueiro. NeumoVigo I+I Research Group, IIS Galicia Sur, Vigo, Spain.
6 Department of Respiratory Medicine and Allergology, Skåne University Hospital, Lund University, Malmö, Sweden.
7 Servicio de Neumología, Complejo Hospitalario Clínico-Universitario de Santiago, Santiago de Compostela, Spain.
8 Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III, Madrid, Spain.
9 Unidad Médico-Quirúrgica de Enfermedades Respiratorias. Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/Universidad de Sevilla, Sevilla, Spain.
10 Department of Pneumology, Thomayer Hospital, First Faculty of Medicine, Charles University, Prague, Czech Republic.
11 Pulmonology Department, Hospital da Senhora da Oliveira, Guimarães, Portugal.
12 Servicio de Neumología. Hospital Clínico de San Carlos. Departamento de Medicina, Facultad de Medicina,, Universidad Complutense de Madrid, Madrid, Spain.
13 Research Institute of Hospital Clínico San Carlos (IdISSC), Madrid, Spain.
14 Pneumology Unit, IRCCS San Matteo Hospital Foundation, Pavia, Italy.
15 Department of Internal Medicine and Therapeutics, University of Pavia, Pavia, Italy.
16 Pneumology Department, Hospital Universitario Central de Asturias, Instituto de Investigacion Sanitaria del Principado de Asturias, Oviedo, Spain.
17 Pneumology Department, Hospital Universitario Nuestra Señora de La Candelaria, Santa Cruz de Tenerife, Spain.
19 Department of Respiratory Medicine, University Hospitals of Coventry and Warwickshire, Clifford Bridge Road, Coventry, UK.
20 Servicio de Neumología. Hospital Clínico Universitario San Cecilio. Departamento de Medicina, Facultad de Medicina, Universidad de Granada, Granada, Spain.
21 Clinic for Respiratory Diseases, University Hospital Center Zagreb, Zagreb, Croatia.
22 School of Medicine, University of Zagreb, Zagreb, Croatia.
23 Laboratory of Respiratory Diseases, Department of Chronic Disease, Metabolism and Ageing, Katholieke Universiteit (KU) Leuven, Leuven, Belgium.
24 Department of Respiratory Diseases, University Hospitals Leuven, Leuven, Belgium.