1. Division of Molecular and Clinical Medicine, University of Dundee, Ninewells Hospital and Medical School, Dundee, United Kingdom;
2. Population and Health Science Institute, Newcastle University and National Institute for Health and Care Research Biomedical Research Centre for Ageing, Freeman Hospital, Newcastle, United Kingdom;
3. Respiratory Unit, Scientific Institutes of Hospitalization and Care Humanitas Research Hospital, Milan, Italy;
4. Department of Biomedical Sciences, Humanitas University, Milan, Italy;
5. Pneumology Department, Hospital Universitari Vall d’Hebron, Vall d’Hebron Institut de Recerca, Vall d’Hebron Barcelona Hospital Campus, Biomedical Research Centre, Barcelona, Spain; and
6. Thorax Institute, Institute of Biomedical Research August Pi i Sunyer, University of Barcelona, Barcelona, Spain