**Author details**

Hirotaka Okamoto

Department of Surgery, Tsuru Municipal Hospital, Department of Gastrointestinal, Breast and Endocrine Surgery, University of Yamanashi, Japan

\*Address all correspondence to: hirotakaoka@hotmail.com

© 2021 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.
