1. Department of clinical pharmacology, QPS-Netherlands, Groningen, the Netherlands
2. Department of Allergology, Internal Medicine, University Medical Centre Groningen, University of Groningen, Groningen, the Netherlands
3. Department of Clinical Pharmacy and Pharmacology, University Medical Centre Groningen, University of Groningen, Groningen, the Netherlands
4. Department of Respiratory Medicine and Allergology, Institute for Clinical Science, Skane University Hospital, Lund, Sweden
5. Department of Respiratory Medicine, First Faculty of Medicine of Charles University and Thomayer Hospital, Prague, Czech Republic