1. Department of Medicine, Division of Hematology, Karolinska University Hospital Solna and Karolinska Institutet, Stockholm, Sweden;
2. Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD;
3. Department of Medicine, McMaster University, Hamilton, ON;
4. Department of Medicine, Section of Hematology and Coagulation, Sahlgrenska University Hospital, Gothenburg, Sweden;
5. Cancer Centre, Section of Hematology, Umea University Hospital, Umea, Sweden;
6. Department of Medicine, Section of Hematology, Malmö University Hospital, Malmö, Sweden; and
7. Medical Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD