1. Department of Dermatology; Hokkaido University School of Medicine; Sapporo Japan
2. Department of Periodontics and Endodontics; Hokkaido University School of Dentistry; Sapporo Japan
3. Department of Dermatology; Hiroshima University School of Medicine; Hiroshima Japan
4. Department of Dermatology; Kushiro-Rosai Hospital; Kushiro Japan