1. Human Augmentation Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Kashiwa, Chiba, Japan
2. Human Augmentation Research Center, AIST, Kashiwa, Chiba, Japan
3. Artificial Intelligence Research Center, AIST, Tsukuba, Ibaraki, Japan
4. Faculty of Advanced Engineering, Department of Medical and Robotic Engineering Design, Tokyo University of Science, Katsushika-ku, Tokyo, Japan