1. Department of Palliative Care, Shimane University Faculty of Medicine, Izumo, Japan.
2. Data Intelligence Department, Daiichi Sankyo Co., Ltd., Tokyo, Japan.
3. Department of Anesthesiology, Palliative Care Center, Shimane University Hospital, Izumo, Japan.
4. Statistical Analysis Department, Mebix, Inc., Tokyo, Japan.
5. Primary Medical Science Department, Daiichi Sankyo Co., Ltd., Tokyo, Japan.
6. Quantitative Clinical Pharmacology Department, Daiichi Sankyo Co., Ltd., Tokyo, Japan.
7. Department of Anesthesiology, Shimane University Faculty of Medicine, Izumo, Japan.