1. Faculty of Medicine; University of Iceland; Reykjavík Iceland
2. Department of Dermatology; Sahlgrenska University Hospital; Gothenburg Sweden
3. Department of Dermatology; Landspitali University Hospital; Reykjavík Iceland
4. Department of Immunology; Landspitali University Hospital; Reykjavík Iceland
5. Department of Pathology; Landspitali University Hospital; Reykjavík Iceland