1. Centre for Human Drug Research, Leiden, The Netherlands
2. Merck Research Laboratories, Rahway, New Jersey, USA
3. Novartis, New York, NY, USA
4. Department of Respiratory Medicine and Allergology, Skane University Hospital, Lund, Sweden
5. Department of Clinical & Pharmacology, University Medical Center Groningen, Groningen, The Netherlands
6. Department of General Practice, University Medical Center Groningen, Groningen, The Netherlands
7. QPS Netherlands, Groningen, The Netherlands
8. Janssen Biologics B.V., Leiden, The Netherlands
9. EMD Serono, Rockland, MA, USA