18 Dept of Medical Sciences, Respiratory, Allergy and Sleep Research, Uppsala University, Uppsala, Sweden.
19 Seinäjoki Central Hospital, Seinäjoki, Finland.
20 Allergy Centre, Tampere University Hospital, Tempere, Finland.
21 Dept of Allergy, Respiratory Diseases and Allergology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.
22 Division of Medicine, Dept of Pulmonary Diseases, Turku University Hospital, Turku, Finland.
23 Dept of Pulmonary Diseases and Clinical Allergology, University of Turku, Turku, Finland.
24 Haukeland University Hospital, Bergen, Norway.
25 Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland.
26 Dept of Internal Medicine at Institute of Medicine/Krefting Research Centre, University of Gothenburg and Sahlgrenska University Hospital, Gothenburg, Sweden.
27 Dept of Respiratory Medicine, Hvidovre University Hospital and Institute of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.