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Article History
Received: 11 February 2021
Revised: 24 June 2021
Accepted: 2 July 2021
First Online: 11 August 2021
Declarations
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: The authors have no conflicting interests to disclose.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee (The Institutional Review Board and the Ethics Committee of Gunma University Graduate School of Medicine) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study formal consent is not required.
