1. Department of Clinical Biochemistry
2. The Copenhagen General Population Study, and
3. Faculty of Health and Medical Sciences and
4. 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
5. Department of Internal Medicine, Section of Respiratory Medicine, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark
6. Department of Public Health, Section of Epidemiology, University of Copenhagen, Copenhagen, Denmark; and