1. Nasco AD Biotechnology Laboratory, 11 Sachtouri Str., Piraeus 18536, Greece
2. Department of Hygiene, Microbiology and Social Medicine, Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, Innsbruck, Austria
3. Department of Immunology, Jagiellonian University Medical College, Krakow, Poland
4. National Hellenic Research Foundation, 48 Vasileos Konstantinou Str., Athens, Greece