1. Department of International Health, Immunology and Microbiology; Faculty of Health and Medical Sciences, University of Copenhagen; DK-2200 Copenhagen Denmark
2. Department of Dermato-Allergology; Copenhagen University Hospital Gentofte; DK-2900 Hellerup Denmark
3. Department of Clinical Pathology; Hospital South, Naestved Hospital; DK-4700 Naestved Denmark
4. Department of Biomedical Sciences; Faculty of Health and Medical Sciences, University of Copenhagen; DK-2200 Copenhagen Denmark