1. Dick White Referrals, Station Farm; Cambridgeshire CB8 0UH UK
2. AO Foundation; Preclinical Services Focus Area Surgery; 7270 Davos Switzerland
3. Division of Small Animal; Vetsuisse Faculty; University of Zürich; 8057 Zurich Switzerland
4. Division of Anaesthesiology; Vetsuisse Faculty; University of Zürich; 8057 Zurich Switzerland