1. Division of Clinical Epidemiology, Department of Medicine SolnaKarolinska Institutet Stockholm Sweden
2. Department of HematologyKarolinska University Hospital Solna Sweden
3. Department of Medical Epidemiology and BiostatisticsKarolinska Institutet Stockholm Sweden
4. Department of OncologyAkademiska University Hospital Uppsala Sweden
5. Department of HematologySouth Älvsborg Hospital Borås Sweden
6. Sahlgrenska AcademyGothenburg University Gothenburg Sweden
7. Department of Oncology and Pathology, Institute of Clinical SciencesLund University Lund Sweden