1. Yokohama Yamate Dog & Cat Medical Center, 27-4 Kashiwaba Naka-ku Yokohama, Kanagawa, 231-0866, Japan
2. Tokyo Veterinary Cardiology Center, 8-9-12 Izumi Building 2F, Fukazawa, Setagaya, Tokyo 158-0081, Japan
3. Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, 582 Bunkyodai-Midorimachi, Ebetsu, Hokkaido 069-8501, Japan