Funding

VBG Group Herman Krefting Foundation for Asthma and Allergy Research, the Swedish Research Council, the Research Foundation of the Swedish Asthma and Allergy Association, the Nordic Epilung under the support of Nordforsk, the Swedish Heart-Lung Foundation, and the Swedish government under the ALF agreement between the Swedish government and the county councils (Västra Götaland). None of the sponsors had any involvement in the planning, execution, drafting or write-up of this study.