1. Japanese Melanoma Study Group Tsukuba Japan
2. Prognosis and Statistical Investigation Committee of the Japanese Skin Cancer Society Kumamoto Japan
3. Department of Dermatology University of Tsukuba Tsukuba Japan
4. Department of Dermatology Shizuoka Cancer Center Shizuoka Japan
5. Department of Dermatology Shinshu University School of Medicine Matsumoto Japan
6. Department of Dermatology Niigata Cancer Center Niigata Japan
7. Department of Dermatology University of Nagoya Nagoya Japan
8. Department of Dermatology University of Kyushu Fukuoka Japan
9. Department of Dermatology Osaka City University Osaka Japan
10. Department of Dermatology Saitama Medical University International Medical Center Hidaka Japan
11. Department of Dermatology Kyoto Prefectural University of Medicine Kyoto Japan
12. Department of Dermatology Sapporo Medical University Sapporo Japan
13. Department of Dermatology Kobe University Kobe Japan
14. Department of Dermatology and Plastic Surgery Kumamoto University Kumamoto Japan
15. Department of Dermatology Asahikawa Medical University Asahikawa Japan
16. Department of Dermatology, Nippon Medical School Bunkyo‐ku Japan
17. Department of Dermatology Okayama University Graduate School of Medicine Okayama Japan
18. Department of Dermatology Tohoku University Graduate School of Medicine Sendai Japan
19. Department of Dermatologic Oncology National Cancer Center Hospital Tokyo Japan
20. Department of Dermatology University of Occupational and Environment Health Kitakyushu Japan
21. Department of Plastic Surgery University of Hokkaido Sapporo Japan
22. Department of Dermatology Saitama Medical University Hidaka Japan
23. Department of Dermatology University of Gifu Gifu Japan
24. Department of Dermatology Toyama Prefectural Central Hospital Toyama Japan
25. Department of Dermatology Fukuoka University Fukuoka Japan
26. Department of Dermatology Hamamatsu University School of Medicine Hamamatsu Japan
27. Department of Dermatology Saitama Prefectural Cancer Center Saitama Japan
28. Department of Dermatology University of Tokyo Tokyo Japan
29. Department of Dermatology Toranomon Hospital Minato‐ku Japan
30. Department of Dermatology Kagoshima University Kagoshima Japan