1 Department of Dermatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Japan. Electronic address: risat@koto.kpu-m.ac.jp.
2 Department of Biostatistics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Japan.
3 Department of Dermatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Japan.