1. Department of Pulmonology; Landspitali University Hospital; Reykjavik Iceland
2. Faculty of Medicine; University of Iceland; Reykjavik Iceland
3. Department of Pathology; Akureyri Hospital; Reykjavik Iceland
4. Department of Pathology; Landspitali University Hospital; Reykjavik Iceland
5. Department of Cardiothoracic Surgery; Landspitali University Hospital; Reykjavik Iceland