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