Asai, Sakurako
Nakamura, Shin
Toriihara, Akira
Tateishi, Ukihide
Kurabayashi, Tohru
Article History
Received: 5 June 2019
Accepted: 29 July 2019
First Online: 28 August 2019
Compliance with ethical standards
:
: All authors declare that they have no conflict of interest.<b>Ethical standards</b>All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation and with Helsinki Declaration of 1975, as revised in 2008. Informed consent from each patient was waived because of the retrospective nature of the study.