1. Department of Veterinary Pathology, College of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
2. Center of Clinical Comparative Oncology, Department of Clinical Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden
3. Pathological Anatomy Laboratory Service, Department of Veterinary Public Health and Animal Pathology, Faculty of Veterinary Medicine, Bologna University, Bologna, Italy
4. Institute of Molecular Pathology and Immunology of the University of Porto, Institute of Biomedical Sciences of Abel Salazar, University of Porto, Porto, Portugal