1. Multimorbidity Patients Unit, Internal Medicine, Hospital Universitari Mutua de Terrassa, Universitat de Barcelona, Barcelona, Spain;
2. Geisel School of Medicine at Dartmouth, Hanover, NH, USA;
3. Pneumology Department, Hospital Universitary Vall d’Hebron, CIBER de Enfermedades Respiratorias (CIBERES), Barcelona, Spain;
4. Pneumology Service, Hospital Universitari Mútua Terrassa, Barcelona, Spain;
5. Department of Pulmonary Medicine, Kepler-University-Hospital, Linz, Austria;
6. Faculty of Medicine, Johannes-Kepler-University, Linz, Austria;
7. Facultad de Medicina, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico;
8. Department of Pulmonary Medicine, Paracelsus Medical University Hospital, Salzburg, Austria;
9. Universidad de Sevilla. Departamento de Medicina. HU Virgen de Valme. Sevilla. Spain;
10. Hospital Universitario Nuestra Señora de La Candelaria, Universidad de La Laguna, Tenerife, Spain;
11. Hospital Galdakao-Usansolo, Galdakao, Bizkaia, Spain;
12. Servicio de Neumología, Hospital Arnau de Vilanova, Valencia, Spain;
13. Clinica Universidad de Navarra, Pamplona, Spain;
14. Pulmonary and Critical Care Medicine, Harvard University, Brigham and Women’s Hospital, Boston, MA, USA;
15. Hospital Universitario Miguel Servet, Zaragoza, and CIBER de Enfermedades Respiratorias (CIBERES), Spain;
16. Department of General Practice, Academic Medical Center, University of Amsterdam (AMC), Amsterdam, The Netherlands;
17. Hospital Universitario Araba, Sede Txagorritxu, Vitoria, Spain for Universitary Hospital of Cruces in Barakaldo, Spain;
18. Section of Social Medicine, Department of Public Health, Copenhagen University, Copenhagen City Heart Study, Frederiksberg Hospital, Frederiksberg, Copenhagen, Denmark;
19. ISGlobal, Centre for Research in Environmental Epidemiology (CREAL), Barcelona, Spain;
20. Department of Experimental and Health Sciences, Universitat Pompeu Fabra (UPF), Barcelona, Spain;
21. CIBER Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain;
22. Institute of Applied Health Research, University of Birmingham, Edgbaston, UK;
23. Internal Medicine, Division of Pulmonary and Critical Care Medicine, University of Michigan, Ann Arbor, MI, USA;
24. Department of Public Health and Nursing, NTNU, Norwegian University of Science and Technology, Trondheim, Norway;
25. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA;
26. Centre for Clinical Documentation and Evaluation, Northern Norway Regional Health Authority, Tromso, Norway;
27. Department of Clinical Science, University of Bergen, Bergen, Norway;
28. Department of Global Public Health and Primary Care, University of Bergen, Bergen, Bergen, Norway;
29. Department of Respiratory Care and Sleep Control Medicine, Kyoto University, Kyoto, Japan;
30. Department of Respiratory Medicine, Hospital Son Espases-IdISPa, Ciberes, Mallorca, Spain;
31. Servicio de Neumología, Hospital Universitario de la Princesa (IISP), Universidad Autónoma de Madrid, Cátedra UAM-Linde, Madrid, Spain;
32. Servicio de Neumonología, Hospital San Juan de Dios de La Plata, Buenos Aires, Argentina;
33. Respiratory Medicine, Cochin Hospital APHP, University Paris Descartes, Paris, France;
34. James Hogg Research Centre, University of British Columbia, Vancouver, BC, Canada;
35. Division of Respiratory Medicine, Department of Medicine, St Paul’s Hospital, Vancouver, BC, Canada;
36. Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland;
37. Instituto de Investigación Hospital Universitario de la Princesa (IISP), Universidad Autónoma de Madrid, Cátedra UAM-Linde, Madrid, Spain