1. Department of Clinical ChemistryKuopio University Hospital Kuopio FIN-70211 Finland
2. Department of Pathology Los Angeles California 90027 USA
3. Department of Pathology and Forensic MedicineKuopio University Kuopio FIN-70210 Finland
4. Division of Haematology/OncologyChildren's Hospital Los Angeles Research InstituteUSC School of Medicine Los Angeles California 90027 USA
5. Department of Clinical Chemistry and HematologyTurku University Hospital Turku FIN-20521 Finland