1. Department of Nursing Osaka Medical and Pharmaceutical University Takatsuki Osaka Japan
2. Department of Human Health Sciences, Graduate School of Medicine Kyoto University Kyoto Japan
3. Department of Health Sciences, Graduate School of Medicine Nagoya University Nagoya Aichi Japan
4. Department of Health Sciences, Graduate School of Medicine Osaka University Suita Osaka Japan
5. Department of Medical Statistics, Research & Development Center Osaka Medical and Pharmaceutical University Takatsuki Japan
6. Department of Palliative Care Daini Kyoritsu Hospital Kawanishi Hyogo Japan
7. Department of Palliative Care Senri‐chuo Hospital Toyonaka Osaka Japan
8. Department of Health Sciences, Graduate School of Medicine Tokyo Medical and Dental University Tokyo Japan