1. Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, V.le F. Stagno D’Alcontres 31, Messina I-98166, Italy
2. Laboratory for Molecular Virology and Gene Therapy, Department of Pharmaceutical and Pharmacological Sciences, UZ St. Rafael, Kapucijnenvoer 33, BE-3000 Leuven, Belgium