1. Department of Medical Biochemistry and Cell Biology, Institute of Biomedicine, University of Gothenburg, SE-405 30 Gothenburg, Sweden
2. Department of Molecular Biology, Umeå University, SE-901 87 Umeå, Sweden
3. Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, SE-405 30 Gothenburg, Sweden
4. Department of Clinical Immunology and Transfusion Medicine, Sahlgrenska University Hospital, Region Västra Götaland, SE-41346 Gothenburg, Sweden