1 Department of Veterinary Medicine, University of Teramo, Teramo, Italy.
2 Department of Biomolecular Health Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, Netherlands.
3 Department of Veterinary Medicine, University of Perugia, Perugia, Italy.
4 Flint Animal Cancer Center, Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Ft. Collins, CO, United States.
5 VCA Clinical Studies, Los Angeles, CA, United States.