1. Regional Public Health Laboratory, Hellenic Center for Disease Control and Prevention; Alexandroupolis Greece
2. Paediatric Department, Medical School; Democritus University of Thrace; Komotini Greece
3. Immunology Department of Microbiology Laboratory; University General Hospital of Alexandroupolis; Alexandroupolis Greece
4. Laboratory of Hygiene and Environmental Protection, Medical School; Democritus University of Thrace; Komotini Greece
5. Laboratory of Microbiology, Medical School; Democritus University of Thrace; Komotini Greece