1. Department of Virology Institute of Haematology and Transfusion Medicine Warsaw Poland
2. Department of Virology National Institute of Public Health ‐ National Research Institute Warsaw Poland
3. Regional Blood Transfusion Centre Kalisz Poland
4. Department of Infectious, Tropical Diseases and Immune Deficiency Pomeranian Medical University in Szczecin Szczecin Poland
5. Regional Blood Transfusion Centre Olsztyn Poland
6. Department of Infectious Diseases and Hepatology Silesian Medical University Bytom Poland
7. Department of Transfusion Medicine Institute of Haematology and Transfusion Medicine Warsaw Poland