1. Department of Pulmonary Diseases, Center of Excellence for Asthma, COPD and Respiratory Allergy Franciscus Gasthuis and Vlietland Rotterdam Netherlands
2. Department of Pulmonary Diseases Erasmus Medical Centrum Rotterdam Netherlands
3. Long Alliantie Nederland (LAN) Amersfoort Netherlands
4. Department of Pulmonary Diseases Martini Hospital Groningen Netherlands
5. Department of Pulmonary Diseases Amsterdam University Medical Center Amsterdam Netherlands
6. Coöperatie PreventPartner Malden Netherlands
7. Polikliniek Mens en Arbeid Amsterdam University Medical Center Amsterdam Netherlands
8. General Practitioner Maarssen Netherlands
9. National Heart and Lung Institute, Imperial College London; Asthma UK Centre in Allergic Mechanisms of Asthma London UK