1. Tokyo University of Agriculture and Technology, Fuchu, Tokyo, 183-8509, Japan
2. Kansai Guide Dogs for the Blind Association, 18-2 Hitsujigatani, Inukai, Sogabe-cho, Kameoka, Kyoto, 621-0027, Japan
3. Nihon Institute of Medical Science, 1276 Shimokawara, Geroyama-cho, Iruma, Saitama, 350-0435, Japan
4. Kansai Guide Dogs for the Blind Association, Kyoto, Japan