1. Faculty of Life and Medical Sciences, Doshisha University, Kyotanabe, 610-0394, Japan
2. Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology (NICT), Seika-cho, 619-0289, Japan
3. Human Informatics and Interaction Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8566, Japan
4. Pixie Dust Technologies, Inc., Chiyoda-ku, 101-0061, Japan, , , , , ,