**Author details**

Tomoko Ohshima\*, Tomomi Kawai and Nobuko Maeda Department of Oral Microbiology, School of Dental Medicine, Tsurumi University, Yokohama, Japan

\*Address all correspondence to: ohshima-t@fs.tsurumi-u.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.

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