1. Department of Dermatology National Center for Global Health and Medicine 1‐21‐1 Toyama, Shinjuku Tokyo 162‐8655 Japan
2. Department of Regenerative Medicine Research Institute National Center for Global Health and Medicine 1‐21‐1 Toyama, Shinjuku Tokyo 162‐8655 Japan
3. Department of Dermatology Osaka City University Graduate School of Medicine 1‐4‐3 Asahimachi, Abeno Osaka 545‐8585 Japan
4. Department of General Internal Medicine National Center for Global Health and Medicine 1‐21‐1 Toyama, Shinjuku Tokyo 162‐8655 Japan
5. Department of Dermatology Kyorin University School of Medicine 6‐20‐2 Shinkawa, Mitaka Tokyo 181‐8611 Japan
6. Department of Dermatology Kurume University School of Medicine and Kurume University Institute of Cutaneous Cell Biology 67 Asahichou, Kurume Fukuoka 830‐0011 Japan