1. Department of Dermatology; Hokkaido University Graduate School of Medicine; North 15 West 7 Sapporo 060-8638 Japan
2. Department of Otolaryngology; Hokkaido University Graduate School of Medicine; North 15 West 7 Sapporo 060-8638 Japan
3. Department of Nuclear Medicine; Hokkaido University Graduate School of Medicine; North 15 West 7 Sapporo 060-8638 Japan