1. Department of Oral Medicine and Periodontal Diseases, Medical University of Warsaw, ul. Miodowa 18, 00-246 Warsaw, Poland
2. Department of Hematology, University Hospital in Cracow, ul. Kopernika 17, 31-501 Cracow, Poland
3. Department and Clinic of Haematology, Oncology and Internal Medicine, Medical University of Warsaw, ul. Banach 1A, 02-097 Warsaw, Poland