Hideyuki Masuda1, Akimichi Morita2. 1. Department of Geriatric and Environmental Dermatology, Nagoya City University, Graduate School of Medical Sciences, Nagoya, Japan; USHIO INC, Tokyo, Japan. 2. Department of Geriatric and Environmental Dermatology, Nagoya City University, Graduate School of Medical Sciences, Nagoya, Japan. Electronic address: amorita@med.nagoya-cu.ac.jp.