1 Faculty of Veterinary Medicine, University of Teramo, Teramo, Italy.
2 Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, United States.
3 Faculty of Veterinary Medicine, Instituto Universitario de Sanidad Animal y Seguridad Alimentaria, University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain.
4 Department of Comparative Biomedicine and Food Science, University of Padua, Padua, Italy.