1. Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine; Utrecht University; Utrecht The Netherlands
2. GD Animal Health; 7400 AA Deventer The Netherlands
3. Holstege groep, Princess Maxima Center for Pediatric Oncology, Uppsalalaan 8; 3584 CT Utrecht The Netherlands
4. Department für Kleintiere und Pferde; Veterinärmedizinische Universität Wien; Vienna Austria