1. Department of Dermatology Nippon Medical School Tokyo Japan
2. Medical Affairs Kyowa Kirin Co., Ltd. Tokyo Japan
3. Biostatistics Center Kurume University Fukuoka Japan
4. Department of Dermatology JR Sapporo Hospital Sapporo‐shi Japan
5. Department of Dermatology University of the Ryukyus Okinawa Japan
6. Takagi Dermatological Clinic Obihiro‐shi Japan
7. Department of Dermatology Teikyo University School of Medicine Tokyo Japan
8. Department of Dermatology Nippon Life Hospital Osaka Japan
9. Department of Dermatology Toho University School of Medicine Tokyo Japan
10. Department of Dermatology Fukuoka University Faculty of Medicine Fukuoka Japan