1. Faculty of Veterinary Medicine, Department of Clinical Sciences of Companion Animals, Utrecht University, Utrecht, The Netherlands.
2. Flow Cytometry Unit, Faculty of Veterinary Medicine, Division of Immunology, Utrecht University, Utrecht, The Netherlands.
3. Department of Surgery, Lukas Krankenhaus GmbH, Neuss and Insulinoma and GEP-NET Tumor Center Neuss-Dusseldorf, Neuss, Germany.
4. Department of Pathology, GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, The Netherlands.