Affiliation: | 1. Department of Human Ecology, Okayama University Graduate School of Environmental and Life Science, 3-1-1 Tsushima-naka, Kita-ku, Okayama, 700–8558, Japan;2. Department of Public Health and Health Policy, Institute of Biomedical & Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734–8551, Japan;3. Department of Mathematical Information Science, Okayama University of Science, 1–1, Ridai-cho, Kita-ku, Okayama 700–0005, Japan |