1. Department of Pharmacy, Yokohama City University Medical Center, Yokohama, Japan.
2. Department of Analytical Chemistry, Tokyo University of Pharmacy and Life Sciences, Tokyo, Japan.
3. Department of Practical Pharmacy, Tokyo University of Pharmacy and Life Sciences, Tokyo, Japan.
4. Department of Anesthesiology, Yokohama City University Medical Center, Yokohama, Japan.
5. Department of Palliative Medicine, Yokohama City University Medical Center, Yokohama, Japan.
6. Department of Pharmacy, National Cancer Center Hospital East, Kashiwa, Japan.
7. Department of Palliative Medicine, National Cancer Center Hospital East, Kashiwa, Japan.
8. Department of Pharmacy, Tokyo Medical University Hospital, Tokyo, Japan.
9. Department of Palliative Medicine, Tokyo Medical University Hospital, Tokyo, Japan.
10. Department of Pharmacy and Yokohama Minami Kyousai Hospital, Yokohama, Japan.
11. Department of Palliative and Supportive Care, Yokohama Minami Kyousai Hospital, Yokohama, Japan.
12. Department of Pharmacy, Kameda Medical Center, Chiba, Japan.
13. Division of Biostatistics, Tohoku University Graduate School of Medicine, Sendai, Japan.