1. Department of Medicine, Division of Hematology, Karolinska University Hospital and Institutet, Stockholm, Sweden;
2. Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD;
3. Section of Hematology, Department of Medicine, Malmö University Hospital, University of Lund, Malmö, Sweden; and
4. Department of Medicine, Section of Hematology and Coagulation, Sahlgrenska University Hospital, Gothenburg, Sweden