1 Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan.
2 Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan. Electronic address: yanagi@med.hokudai.ac.jp.
3 Department of Neurology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan.
4 Department of Neurosurgery, Sapporo Teishinkai Hospital, Sapporo, Japan.
5 Department of Dermatology, Wakayama Medical University, Wakayama Prefecture, Japan.