1. Pharmaceutical Care Unit; Faculty of Pharmaceutical Sciences; Ghent University; Ghent Belgium
2. Department of Clinical Pharmacy; University of Liège; Liège Belgium
3. Heymans Institute of Pharmacology, Faculty of Medicine and Health Sciences; Ghent University; Ghent Belgium
4. Department of Family Medicine and Primary Health Care; Faculty of Medicine and Health Sciences; Ghent University Hospital; Ghent Belgium
5. Department of Respiratory Medicine; Ghent University Hospital; Ghent Belgium
6. Departments of Epidemiology and Respiratory Medicine; Erasmus MC; Rotterdam The Netherlands