1. First Department of Internal Medicine, Department of Hematology, Medical University, Plovdiv, Bulgaria;
2. Clinic of Clinical Hematology, University Hospital “Sv. Georgi”, Plovdiv, Bulgaria;
3. Department of Clinical Laboratory, University Hospital “Sv. Georgi”, Plovdiv, Bulgaria;
4. Department of Imaging Diagnostics, Medical University, Plovdiv, Bulgaria;
5. Department of Medical Oncology, University Hospital “Sv. Georgi”, Plovdiv, Bulgaria