1. Department of Medical Epidemiology and Biostatistics; Karolinska University Hospital; Stockholm Sweden
2. Department of Hematology; Karolinska University Hospital; Stockholm Sweden
3. Department of Clinical Immunology and Transfusion Medicine; Karolinska University Hospital; Stockholm Sweden
4. Department of Laboratory Medicine; Karolinska Institutet; Stockholm Sweden
5. Department of Immunology, Genetics and Pathology; Uppsala University; Uppsala Sweden
6. Transfusion Medicine, NHS Blood and Transplant, and the Department of Hematology, Oxford University Hospitals NHS Foundation Trust, Radcliffe Department of Medicine; University of Oxford, and Oxford BRC Hematology Theme; Oxford UK
7. Department of Epidemiology Research; Statens Serum Institut
8. Department of Hematology; Copenhagen University Hospital; Copenhagen Denmark