1. Department of Veterinary Anaesthesiology and Pain TherapyVetsuisse FacultyUniversity of BernLaenggassstrasse 124Bern3012Switzerland
2. Department of Companion Animal Clinical SciencesNorwegian School of Veterinary ScienceOsloNorway
3. Department of Food Safety & Infection Biology Section of Veterinary Pharmacology and ToxicologyNorwegian Veterinary SchoolPO Box 8146 DepOslo0033Norway