1. Department of Dermatology, Keio University School of Medicine, Tokyo, Japan
2. Department of Dermatology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
3. Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan
4. Department of General Pediatrics, Tokyo Metropolitan Children’s Medical Center, Fuchu, Japan
5. Department of Pathology, Keio University School of Medicine, Tokyo, Japan