1. The Copenhagen City Heart Study, Copenhagen University Hospital–Frederiksberg, Copenhagen, Denmark;
2. Medical Department, Copenhagen University Hospital–Herlev, Herlev, Denmark;
3. Division of Infection, Immunity and Respiratory Medicine, University of Manchester, Manchester, United Kingdom;
4. North West Lung Centre, Manchester University NHS Foundation Trust, Manchester, United Kingdom; and
5. Section of Epidemiology, Department of Public Health, University of Copenhagen, Copenhagen, Denmark