1. Department of Veterinary Medicine of Bari, University of Bari, Valenzano, Bari, Italy (Cavalli, Desario, Mari, Lorusso, Cirone, Buonavoglia, Decaro)
2. Faculty of Veterinary Medicine, Agricultural University, Tirana, Albania (Kusi, Kumbe)
3. Istituto Zooprofilattico Sperimentale di Puglia e Basilicata, Foggia, Italy (Colaianni)