1. Center for Clinical Research and Prevention Bispebjerg and Frederiksberg Hospital Frederiksberg Denmark
2. Department of Clinical Medicine University of Copenhagen Copenhagen Denmark
3. Global Marketing ALK‐Abelló A/S Hørsholm Denmark
4. Department of Allergology Allergy and Lung Clinic Helsingør Helsingør Denmark
5. Section of Biostatistic, Department of Public Health University of Copenhagen Copenhagen Denmark