1. Department of Microbiology, Medical School, University of Athens, Athens
2. Department of Microbiology, Serres General Hospital, Serres
3. Department of Microbiology, Saint Panteleimon Hospital, Nicea
4. Department of Microbiology, Medical School, University of Thessaly, Larissa
5. Department of Internal Medicine, Saint Panteleimon Hospital, Nicea, Greece