1. Department of Respiratory Medicine,
2. The Copenhagen General Population Study, and
3. Department of Clinical Medicine, Faculty of Health and Medical Sciences, and
4. Department of Clinical Biochemistry, Copenhagen University Hospital – Herlev and Gentofte, Copenhagen, Denmark;
5. Section of Epidemiology, Department of Public Health, University of Copenhagen, Copenhagen, Denmark; and
6. Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, Manchester Academic Health Science Centre, University of Manchester, and Manchester University National Health Service Foundation Trust, Manchester, United Kingdom