Sugimoto, Michiko http://orcid.org/0000-0003-0286-7137
Koyama, Koichi
Ichimura, Tomoyuki
Shimono, Taro
Hashiguchi, Yasunori
Miki, Yukio
Article History
First Online: 31 August 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was approved by the ethics board of our institution (Approval No. 4177), and the requirement to obtain informed consent was waived because of the retrospective design.