1. Institute of Biomedicine, Department of Anatomy, University of Turku, Kiinamyllynkatu 10, 20520 Turku, Finland
2. Special Hematology Laboratory, Veterans Affairs Medical Center, Louisville, KY 40206
3. Department of Medicine, University of Connecticut Health Center, Farmington, CT 06030-6145
4. Department of Medicine I, University of Heidelberg, 69115 Heidelberg, Germany