1. Department of Internal Medicine Division of Allergology University Medical Center Groningen University of Groningen Groningen The Netherlands
2. Department of Pathology and Medical Biology University Medical Center Groningen University of Groningen Groningen The Netherlands
3. Groningen Research Institute for Asthma and COPD (GRIAC) Research Institute University Medical Center Groningen Groningen The Netherlands
4. Department of Laboratory Medicine University Medical Center Groningen University of Groningen Groningen The Netherlands
5. Department of Rheumatology and Clinical Immunology University Medical Center Groningen University of Groningen Groningen The Netherlands