1. Department of Parasitology, Veterinary School, Aristotelian University, Thessaloniki, Greece
2. Department of Pharmacology and Experimental Therapeutics, Tufts University School of Medicine, Boston, U.S.A.
3. Division of Immunology, University of Chieti, Italy
4. Infectious Diseases, University of Chieti, Italy
5. Otolaryngology Division, University of Chieti, Italy
6. Dental School, University of Chieti, Italy