1. Department of Respiratory Medicine, Laboratory for Translational Research in Obstructive Pulmonary Diseases, Ghent University Hospital, Ghent, Belgium
2. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, and
3. Graduate Program in Immunology, University of Michigan Medical School, Ann Arbor, Michigan
4. VA Ann Arbor Healthcare System, Ann Arbor, Michigan; and
5. Department of Epidemiology and
6. Department of Respiratory Medicine, Erasmus Medical Center Rotterdam, Rotterdam, the Netherlands