1. Department of Medical Statistics, Research & Development Center, Osaka Medical and Pharmaceutical University, Takatsuki, Japan.
2. Department of Social Epidemiology, Graduate School of Medicine and School of Public Health, Kyoto University, Kyoto, Japan.
3. Department of Patient Support Center, Kyoto Min-iren Asukai Hospital, Kyoto, Japan.
4. Department of Palliative Care, Kyoto Min-iren Asukai Hospital, Kyoto, Japan.