1. Veterinary Internal Medicine, Faculty of Veterinary Medicine, Hokkaido University
2. Department of Animal Phy-siology, Faculty of Agriculture and Veterinary Medicine, Nihon University
3. Department of Veterinary Obsterics and Gynecology, School of Veterinary Medicine, College of Dairying, Rakuno Gakuen University
4. Department of Animal Hos-pital, Faculty of Veterinary Medicine Hokkaido University