1. Clinic of Small Animal Internal Medicine; University of Zurich; Winterthurerstrasse 260 CH-8057 Zurich Switzerland
2. School of Veterinary Medicine; University of California; One Shields Avenue Davis CA 95616 USA
3. Department of Clinical Sciences of Companion Animals; Faculty of Veterinary Medicine; Utrecht University; Yalelaan 8, 3584 CM Utrecht The Netherlands
4. Division of Endocrinology and Diabetology; Department of Medicine; University of Zurich; Rämistrasse 100 8091 Zurich Switzerland