1. Department of Hematology Oncology, Higashi Sapporo Hospital, Sapporo, Japan
2. Department of Gastroenterological Surgery, Fukuoka University, Fukuoka, Japan
3. Palliative Care Team, Seirei Mikatahara Hospital, Shizuoka, Japan
4. General Medical Research Center, Faculty of Medicine, Fukuoka University, Fukuoka, Japan