1. Department of Veterinary Medical Sciences, University of Bologna, Ozzano Emilia, Bologna, Italy
2. School of Veterinary Medicine, Wolaita Soddo University, Wolaita Soddo, Ethiopia
3. Virbac, Italy Milano;
4. Bovine Practitioner, Verona, Italy
5. Istituto Zooprofilattico Sperimentale delle Venezie, Legnaro, PD Legnaro, Italy
6. Departamento de Patologia Animal, Universidade de Santiago de Compostela Campus Universitario, Lugo, Spain