1. Department of Anaesthesia and Intensive Care; Haukeland University Hospital; Bergen Norway
2. Laboratory of Clinical Biochemistry; Haukeland University Hospital; Bergen Norway
3. Department of Occupational Medicine; Haukeland University Hospital; Bergen Norway
4. Department of Clinical Science; University of Bergen; Bergen Norway
5. Department of Medicine; Clinical Immunology and Allergy Unit; Karolinska Institute; Stockholm Sweden
6. Department of Clinical Immunology and Transfusion Medicine; Karolinska University Hospital; Stockholm Sweden
7. Department of Clinical Medicine; Section of Anaesthesiology and Intensive Care; University of Bergen; Bergen Norway