1 Depts of Respiratory Medicine and Intensive Care, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
2 Experimental Asthma Research, Priority Area Asthma & Allergy, Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Airway Research Center North (ARCN), Member of the German Center for Lung Research (DZL), Borstel, Germany.
3 Servei de Pneumolgia, Hospital Universitari Vall d'Hebron, Institut de Recerca Vall Vall d'Hebron, Barcelona, Spain.
4 Dept of Pneumology and Critical Care Medicine, Thoraxklinik, University Hospital Heidelberg, Heidelberg, Germany.
5 Institute of Inflammation and Repair, Wythenshawe Hospital, University of Manchester, Manchester, UK.