1. Department of Clinical Immunology; Center of Clinical Investigation; Copenhagen University Hospital
2. Department of Epidemiology Research; Statens Serum Institut
3. Department of Public Health; University of Copenhagen; Copenhagen Denmark
4. Department of Medical Epidemiology and Biostatistics; Karolinska Institutet; Stockholm Sweden
5. Department of Immunology and Transfusion Medicine; Uppsala University Hospital; Uppsala Sweden
6. Hematology Centre; Karolinska University Hospital; Stockholm Sweden