1. Department of Epidemiology Research; Statens Serum Institute; Copenhagen Denmark
2. Department of Medical Epidemiology and Biostatistics; Karolinska Institutet; Stockholm Sweden
3. Blood Research and Medical Sciences Institutes, Blood Center of Wisconsin; Milwaukee Wisconsin
4. Department of Immunology, Genetics, and Pathology; Uppsala University; Uppsala Sweden
5. Department of Hematology; Copenhagen University Hospital; Copenhagen Denmark
6. Hematology Centre, Karolinska University Hospital; Stockholm Sweden