1. The Institute of Hematology, Warsaw, Poland
2. The Institute of Tuberculosis and Lung Diseases, Warsaw, Poland
3. The Department of Hematology, Medical School, Poznan, Poland
4. The Department of Surgery, Medical School, Poznan, Poland
5. The 1st Department of Surgery, Medical School, Lodz, Poland
6. The Department of Hematology, Medical School, Bialystok, Poland
7. The Department of Vascular Surgery and Transplantology, Medical School, Bialystok, Poland
8. The Medical School, Bialystok, and IV-th Department of Internal Medicine, Medical School, Gdansk, Poland