Chihiro Shimizuhira1, Atsushi Otsuka1, Yosuke Yamamoto2, Kenji Kabashima3. 1. Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan. 2. Department of Healthcare Epidemiology, Kyoto University Graduate School of Medicine, Kyoto, Japan. 3. Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan. Electronic address: kaba@kuhp.kyoto-u.ac.jp.