1. Department of Hematology; Copernicus Memorial Hospital; Medical University of Lodz; Lodz Poland
2. Department of Hematology; Jagiellonian University; Kraków Poland
3. Department of Hematology, Blood Neoplasms and Bone Marrow Transplantation; Wroclaw Medical University; Wroclaw Poland
4. Department of Hematology; Medical University of Białystok; Białystok Poland
5. Department of Hematology; Institute of Hematology and Transfusion Medicine; Warsaw Poland
6. City Clinical Hospital No. 9; Minsk Belarus
7. Roche Poland; Warsaw Poland
8. Department of Experimental Hematology; Copernicus Memorial Hospital; Medical University of Lodz; Lodz Poland