D. Atanasova1,2, G. Tomova1,2, R. Georgieva1,2, H. Hristozova1,3, D. Kapralev1,2,
E. Peteva1,2, K. Petrova1,2, M. Belcheva1,2
1 Clinic of Pediatric Clinical Hematology and Oncology, University Hospital “St. Marina” – Varna
2 Department of Pediatrics, Medical University “Prof. Dr. P. Stoyanov” – Varna
3 Department of Clinical Medical Sciences, Medical University “Prof. Dr. P. Stoyanov” – Varna