1. National Cancer Center Central Hospital Tokyo Japan
2. Miura City Hospital Miura Japan
3. Aichi Cancer Center Central Hospital Nagoya Japan
4. Radiotherapy Center Uji Takeda Hospital Uji Japan
5. Sann‐in Rosai Hospital Yonaga Japan
6. Nara Medical University Kashihara Japan
7. Department of Biostatistics University of Tokyo Tokyo Japan
8. Tokai Central Hospital Kakamigahara Japan
9. Department of Biostatistics School of Public Health Graduate School of Medicine University of Tokyo Tokyo Japan
10. Interfaculty Initiative in Information Studies Graduate School of Interdisciplinary Information Studies Library University of Tokyo Tokyo Japan
11. Japanese Foundation for Multidisciplinary Treatment of Cancer Tokyo Japan