1. Graduate School of Science and Technology, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma, Japan
2. Center for Research on End of Life Care, Weill Cornell Medicine, 1300 York Avenue, New York, NY 10065, USA
3. Faculty of Information and Human Sciences, Kyoto Institute of Technology, Matsugasaki Hashikamicho, Sakyo Ward, Kyoto, Japan