1. Department of Microbiology, Medical School, University of Athens, Athens
2. Department of Microbiology, Medical School, University of Thessaly, Larissa
3. Department of Microbiology, Serres General Hospital, Serres
4. Department of Microbiology, Tzaneion General Hospital, Piraeus
5. Department of Microbiology, Saint Panteleimon General Hospital, Nicea
6. Department of Microbiology, Hippokration University Hospital, Thessaloniki, Greece