1. Dermatology Unit Clinic for Small Animal Internal Medicine Vetsuisse Faculty University of Zurich Winterthurerstrasse 260 8057 Zurich Switzerland
2. Department of Clinical Sciences College of Veterinary Medicine North Carolina State University 1060 William Moore Drive Raleigh NC 27607 USA
3. Department of Veterinary Medicine Faculty of Agriculture Tokyo University of Agriculture and Technology 3‐5‐8 Saiwai‐cho Fuchu Tokyo 183‐8509 Japan