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Authors
Maehana, Takeshi https://orcid.org/0000-0003-2687-1923
Ichihara, Koji
Takahashi, Satoshi
Takahashi, Yusuke
Hashimoto, Kohei
Tanaka, Toshiaki
Masumori, Naoya
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Article History
Received: 1 December 2020
Accepted: 31 May 2021
First Online: 7 June 2021
Declarations
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: The authors have declared that no conflict of interest exists.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee at which the studies were conducted (approval no. 272-96) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Since this was an observational, but not prospective, intervention study, the Ethics Committee provided a waiver of written informed consent. We announced the commencement of this study on our website () with the proviso that the patients who participated in this study could withdraw later.
