1. Veterinary Teaching Hospital of Azabu University, Kanagawa, Japan
2. Laboratory of Small Animal Internal Medicine, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
3. Department of Veterinary Internal Medicine, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
4. Laboratory of Veterinary Pathology, School of Veterinary Medicine, Azabu University, Kanagawa, Japan