1. Department of Dermatology; Faculty of Medicine; University of Tsukuba; Ibaraki Japan
2. Hitachi General Hospital; Ibaraki Japan
3. National Defense Medical College Hospital; Saitama Japan
4. Mito Red Cross Hospital; Ibaraki Japan
5. Ibaraki Prefectural Central Hospital; Ibaraki Japan
6. Mito Saiseikai General Hospital; Ibaraki Japan
7. Tokyo Medical University Ibaraki Medical Center; Ibaraki Japan
8. Mito Medical Center; Ibaraki Japan
9. Tsuchiura Kyodo General Hospital; Ibaraki Japan