1. Department of Dermatologic Oncology, National Cancer Center Hospital, Tokyo
2. JCOG Data Center/Operations Office, National Cancer Center, Tokyo
3. Department of Dermatology, Niigata Cancer Center Hospital, Niigata
4. Department of Dermatology, Shizuoka Cancer Center, Shizuoka
5. Department of Dermatology, Kyushu University Hospital, Fukuoka
6. Department of Dermatology, Saitama Medical University Hospital, Saitama, Japan