1. Department of Dermatology Sapporo Medical University School of Medicine Sapporo Japan
2. Dermatology Division Shizuoka Cancer Center Hospital Shizuoka Japan
3. Department of Dermatologic Oncology Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital Tokyo Japan
4. Department of Dermatology University of Tsukuba Hospital Ibaraki Japan
5. Department of Dermatology Niigata Cancer Center Hospital Niigata Japan
6. Department of Dermato‐Oncology National Hospital Organization Kyushu Cancer Center Fukuoka Japan
7. Department of Dermatology and Plastic Surgery Faculty of Life Sciences Kumamoto University Kumamoto Japan
8. Department of Medical Oncology/Hematology Kobe University Graduate School of Medicine Hyogo Japan
9. Ono Pharmaceutical Co., Ltd. Osaka Japan
10. Department of Dermatologic Oncology National Cancer Center Hospital Tokyo Japan