1. Laboratory of Small Animal Internal Medicine 1, School of Veterinary Medicine, Kitasato University, Higashi 23 Bancho 35-1, Towada 034-8628, Aomori, Japan
2. Laboratory of Veterinary Pharmacology, School of Veterinary Medicine, Kitasato University, Higashi 23 Bancho 35-1, Towada 034-8628, Aomori, Japan
3. Laboratory of Small Animal Surgery 2, School of Veterinary Medicine, Kitasato University, Higashi 23 Bancho 35-1, Towada 034-8628, Aomori, Japan
4. Small Animal Teaching Hospital, School of Veterinary Medicine, Kitasato University, Higashi 23 Bancho 35-1, Towada 034-8628, Aomori, Japan