1. Division of Quality Assurance Program, National Cancer Center , Tokyo , Japan
2. Department of Palliative Nursing , Health Sciences, , Miyagi , Japan
3. Tohoku University Graduate School of Medicine , Health Sciences, , Miyagi , Japan
4. Department of Clinical Data Science , Clinical Research & Education Promotion Division, , Tokyo , Japan
5. National Center of Neurology and Psychiatry , Clinical Research & Education Promotion Division, , Tokyo , Japan
6. Department of Medical Statistics , Faculty of Medicine, , Tokyo , Japan
7. Toho University , Faculty of Medicine, , Tokyo , Japan