1. Department of Medical Epidemiology and Biostatistics; Karolinska Institutet; Stockholm Sweden
2. Hematology Centre; Karolinska University Hospital; Stockholm Sweden
3. Department of Epidemiology Research; Statens Serum Institut; Copenhagen Denmark
4. Department of Clinical Immunology and Transfusion Medicine; Karolinska University Hospital; Stockholm Sweden
5. Department of Immunology, Genetics and Pathology; Uppsala University; Uppsala Sweden
6. Department of Clinical Immunology; Naestved Hospital; Naestved Denmark
7. Department of Clinical Immunology; Aarhus University Hospital; Aarhus Denmark
8. Department of Clinical Immunology; Aalborg University Hospital; Aalborg Denmark
9. Department of Clinical Immunology; Odense University Hospital; Odense Denmark
10. Department of Clinical Immunology; the Blood Bank; Rigshospitalet; University Hospital of Copenhagen; Copenhagen Denmark
11. Department of Clinical Medicine; Copenhagen University; Copenhagen Denmark
12. Department of Medicine; Stanford School of Medicine; Stanford California