1. Research Institute, Morinaga and Company, Limited, 2-1-1 Shimosueyoshi, Tsurumi-ku, Yokohama 230-8504, Japan
2. Department of Dermatology, Yamagata University School of Medicine, Yamagata University, 2-2-2 Iidanishi, Yamagata 990-9585, Japan
3. Faculty of Agriculture and Life Science, Hirosaki University, 3 Bunkyo-cho, Hirosaki 036-8561, Japan
4. Health Care Division, Morinaga and Company, Limited, 2-1-1 Shimosueyoshi, Tsurumi-ku, Yokohama 230-8504, Japan