**Author details**

Suni Lee, Naoko Kumagao-Takei, Kei Yoshitome, Nagisa Sada, Yasumitsu Nishimura and Takemi Otsuki\*

Department of Hygiene, Kawasaki Medical School, Kurashiki, Okayama Prefecture, Japan

\*Address all correspondence to: takemi@med.kawasaki-m.ac.jp

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
