1. Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School, Hannover, Germany;
2. Department of Pathology, Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY;
3. Medilys Laboratory, Hamburg, Germany; and
4. Division of Hematology and Transfusion Medicine, L. Sacco University Hospital, Department of Internal Medicine, Universita' degli Studi di Milano, Milano, Italy