1. From the Departments of Genetics and Pathology, and Oncology, Radiology and Clinical Immunology, Uppsala University, Sweden; the Department of Medical Biosciences, Pathology, Umeå University, Sweden; the Department of Hematology, Linköping University Hospital, Sweden; the Department of Hematology, Huddinge University Hospital, Sweden; and the Department of Clinical Chemistry, Tampere University Hospital and Helsinki University Central Hospital (Jorvi Hospital), Finland.