Authors
Chihiro Hirotsu
Collaborative Research Center, Meisei University, 2–1–1, Hodokubo, Hino–city,, Tokyo, Japan
Harukazu Tsuruta
Tokyo Metropolitan Institute of Gerontology, 35–2 Sakae–cho, Itabashi–ku,, Tokyo, Japan
© 2017 Chihiro Hirotsu, Harukazu Tsuruta, published by Polish Biometric Society
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.