1. Department of Microbiology, Medical School, National and Kapodistrian University of Athens, Athens, Greece.
2. Department of Microbiology, Medical School, University of Ioannina, Dourouti University Campus, Ioannina, Greece.
3. Blood Transfusion Center, G. Genimatas General Hospital, Athens, Greece.
4. Department of Microbiology, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece.
5. Blood Transfusion Center, Saint Andrews General Hospital, Patras, Greece.
6. Blood Transfusion Center, General Hospital of Larisa, Larisa, Greece.
7. Blood Transfusion Center, University General Hospital of Iraklio, Crete, Greece.