1. Microbiology Department, Faculty of Medicine, School of Health Sciences, University of Ioannina, 45110 Ioannina, Greece
2. Laboratory of Hygiene of Foods of Animal Origin – Veterinary Public Health, School of Veterinary Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
3. Medical Faculty and University Hospital Cologne, University of Cologne, Cologne, Germany and Department of Basic and Clinical Sciences, Medical School, University of Nicosia, 2408 Nicosia, Cyprus