Text and Data Mining valid from 2019-06-21
Received: 15 January 2019
Accepted: 17 June 2019
First Online: 21 June 2019
Compliance with ethical standards
: Kuriyama S, Watanabe M, Nakamura S, Nishitani K, Sekiguchi K, Tanaka Y, Ito H, and Matsuda S declare that they have no conflict of interest in association with the present study.
: All procedures were in accordance with the ethical standards of our institutional research committee.
: Informed consent was obtained from the single study participant.