Sugimoto, Shigehiro http://orcid.org/0000-0001-5883-2836
Shimono, Taro
Takeshita, Tohru
Yamamoto, Akira
Shindo, Daisuke
Miki, Yukio
Article History
Received: 21 August 2018
Accepted: 10 January 2019
First Online: 16 January 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Informed consent was waived because of the retrospective nature of our study with pre-existing data. This study was approved by our institutional research board. We declare that all human studies have been performed in accordance with the ethical standards laid down in the 1964 Helsinki declaration and its later amendments.