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1 Department of Respiratory Medicine and Institute of Clinical Research, Odense University Hospital and University of Southern Denmark, Odense Denmark; Manchester Academic Health Science Centre, University Hospital South Manchester NHS Foundation Trust, Southmoor Road, M23 9LT Manchester, UK. Electronic address: jorgen.vestbo@manchester.ac.uk.
2 Section of Social Medicine, Department of Public Health, University of Copenhagen, Copenhagen, Denmark; Section of Respiratory Medicine, Hvidovre Hospital, Hvidovre, Denmark.
1 Department of Respiratory Medicine and Institute of Clinical Research, Odense University Hospital and University of Southern Denmark, Odense Denmark; Manchester Academic Health Science Centre, University Hospital South Manchester NHS Foundation Trust, Southmoor Road, M23 9LT Manchester, UK. Electronic address: jorgen.vestbo@manchester.ac.uk.
2 Section of Social Medicine, Department of Public Health, University of Copenhagen, Copenhagen, Denmark; Section of Respiratory Medicine, Hvidovre Hospital, Hvidovre, Denmark.