1Immunology Department, Landspítali University Hospital, Reykjavík, Iceland. E-mail: [email protected], 2Medical Microbiology and Immunology Departments, University of Aarhus, Aarhus, Denmark. E-mail: [email protected], 3Nephrology Department, Landspítali University Hospital, Reykjavík, Iceland. E-mail: [email protected], 4Pathology Department, Landspítali University Hospital, Reykjavík, Iceland. E-mail: [email protected], 5Immunology Department, Landspítali University Hospital, Reykjavík, Iceland. E-mail: [email protected], 6Immunology Department, Landspítali University Hospital, Reykjavík, Iceland. E-mail: [email protected], 7Landspitali University Hospital, The Blood Bank, Reykjavík, Iceland. E-mail: [email protected]