1. Department of Biomedical Sciences; University of Sassari; Sassari Italy
2. Clinic for Infectious and Tropical Diseases; Clinical Centre of Serbia; Faculty of Medicine; University of Belgrade; Belgrade Serbia
3. Department of Infection and Immunity; King Faisal Specialist Hospital and Research Centre; Riyadh Saudi Arabia
4. Department of Agronomy Animals, Food, Natural Resources and Environment; DAFNAE; University of Padova; Padova Italy