Ikeda, Yoshifumi
Kato, Ritsushi
Mori, Hitoshi
Tsutsui, Kenta
Goto, Koji
Nagase, Takahiko
Tanaka, Sayaka
Asano, Sou
Tawara, Mai
Yukino, Midori
Hasegawa, Saki
Nakano, Shintaro
Iwanaka, Shiro
Muramatsu, Toshihiro
Matsumoto, Kazuo
Article History
Received: 1 May 2019
Accepted: 16 February 2020
First Online: 6 March 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was approved as a retrospective study by the institutional review board of Saitama Medical University, International Medical center (18–226). An informed consent is not necessary in principle in a retrospective study. However, the information of this study is published on the homepage of our institution, and all study subjects have the opportunity to refuse participation in this study.