1. Department of Veterinary Surgery, Faculty of Veterinary Medicine, Tokyo University of Agriculture and Technology, Fuchu-shi, Tokyo 183-8509, Japan
2. Veterinary Cardiovascular Medicine and Surgery Unit, Laboratory of Veterinary Internal Medicine, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252-0880, Japan
3. Laboratory of Veterinary Anesthesiology & Respiratory Research, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252-0880, Japan
4. Heart Will Animal Hospital, 1-2-14 Okidai, Tobata, Kitakyushu, Fukuoka 804-0064, Japan
5. ASAP Animal Clinic, 3597-1 Kannda, Nougata-shi, Fukuoka 822-0001, Japan