1. Department of Veterinary Anatomy, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Japan
2. Department of Veterinary Anatomy, Faculty of Agriculture, Tottori University, Tottori, Japan
3. Veterinary Teaching Hospital, Rakuno Gakuen University, Ebetsu, Japan
4. Meni-one Co., Ltd., Nagoya, Japan