1. Department of Veterinary Medical Sciences, Alma Mater Studiorum, University of Bologna, Via Tolara di Sopra 50, 40064 Ozzano Emilia, Bologna, Italy
2. Department of Biochemistry and Microbiology, Faculty of Sciences, , Ghent University, K.L.Ledeganckstraat 35, B-9000 Gent, Belgium
3. Dipartimento di Scienze Biologiche, Geologiche e Ambientali (BiGeA), Alma Mater Studiorum, Università di Bologna, Via Selmi 3, 40126 Bologna, Italy