1. Department of Palliative Medicine and Advanced Clinical Oncology, IMSUT Hospital, The Institute of Medical Science, The University of Tokyo, Minato-ku, Tokyo, Japan
2. Department of Palliative Care, Japanese Red Cross Medical Center, Shibuya-ku, Tokyo, Japan
3. Department of Palliative Medicine, Cancer Institute Hospital, Koto-ku, Tokyo, Japan
4. Department of Psychosomatic Internal Medicine, Nihon University Itabashi Hospital, Itabashi-ku, Tokyo, Japan