1. Clinic for Small Animal Internal Medicine, Vetsuisse Faculty University of Zurich Zurich Switzerland
2. Section of Epidemiology, Vetsuisse Faculty University of Zurich Zurich Switzerland
3. Division of Small Animal Internal Medicine, Department of Clinical Veterinary Medicine, Vetsuisse Faculty University of Bern Bern Switzerland
4. Division of Infectious Diseases and Hospital Epidemiology University Hospital Zurich, University of Zurich Zurich Switzerland