1. Department of Emergency Medical Service, Wrocław Medical University, Wrocław, Poland
2. Department of Hygiene, Wrocław Medical University, Wrocław, Poland
3. Department of Hematology, Blood Neoplasms and Bone Marrow Transplantation, Wrocław Medical University, Wrocław, Poland
4. Clinic of Infectious Diseases and Hepatology, Wrocław Medical University, Wrocław, Poland