1. Department of Small Animal Clinics, Division of Small Animal Surgery
2. Division of Radiology, University of Zurich, Winterthurerstrasse 260, CH‐8057 Zurich, Switzerland
3. Department of Clinical Veterinary Medicine, Division of Small Animal Surgery, University of Berne, Länggassstrasse 128, CH‐3012 Berne, Switzerland, and Institute for Biomedical Engineering, Swiss Federal Institute of Technology Zurich and University of Zurich, Moussonstrasse 18, CH‐8044 Zurich, Switzerland