1. Department of Clinical SciencesCornell University College of Veterinary MedicineCornell UniversityIthaca NY 14853 USA
2. Department of Population Medicine and Diagnostic Sciences Cornell University College of Veterinary MedicineCornell University Ithaca NY 14853 USA
3. Department of Dermatology Faculty of Medicine University Hospital Zurich Switzerland& University Hospital Zurich Wagistrasse 14 8952 Schlieren Switzerland