1. Department of General Pathology, Pomeranian Medical University, Szczecin, Poland
2. Department of Biochemistry and Medical Chemistry, Pomeranian Medical University, Szczecin, Poland
3. Department of Bone Marrow Transplantation, Pomeranian Medical University, Szczecin, Poland
4. Department of Haematooncology and Bone Marrow Transplantation, Medical University of Lublin, Lublin, Poland