1. Department of Microbiology, Medical School, University of Athens, Athens, Greece
2. Department of Microbiology, Medical School, University of Ioannina, Ioannina, Greece
3. Department of Microbiology, Tzaneio General Hospital, Piraeus, Greece
4. Department of Microbiology, Serres General Hospital, Serres, Greece
5. Department of Microbiology, AHEPA University Hospital, Thessaloniki, Greece