1. Kitasuma Veterinary Hospital, 1–2‐6 Minamiochiai. Suma‐ku. Kobe, tiyogo 654‐0153. Japan
2. *Department of Veterinary Pathology, College of Agriculture, Osaka Prefecture University, 1‐1 Gakuen‐cho, Sakai, Osaka 599–8531, Japan
3. †Veterinary Internal Medicine, College of Agriculture, Osaka Prefecture University, 1‐1 Gakuen‐cho, Sakai, Osaka 599–8531, Japan