1 Laboratory of Veterinary Neurology, Nihon University, Kanagawa, Japan.
2 Laboratory of Veterinary Internal medicine, Nihon University, Kanagawa, Japan.
3 Animal Medical Center, Nihon University, Kanagawa, Japan.
4 Department of Small Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA.