1. Department of General Medicine and Primary Care, University of Tsukuba Hospital , Tsukuba , Japan
2. Medical Liaison and Patient Support Services Center, University of Tsukuba Hospital , Tsukuba , Japan
3. Division of Nursing, University of Tsukuba Hospital , Tsukuba , Japan
4. Department of Palliative Care, Tsuboi Hospital , Koriyama , Japan
5. Department of Palliative Care, Komaki City Hospital , Komaki , Japan
6. Faculty of Medicine, University of Tsukuba , Tsukuba , Japan