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Authors
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Funding
Funding for this research was provided by:
Japan Society for the Promotion of Science (18K10690)
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Article History
Received: 25 February 2019
Accepted: 28 August 2019
First Online: 31 August 2019
Compliance with ethical standards
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: The authors declare that they have no conflict of interests.
: Analysis of our database was approved by the Institutional Review Board of our university (registration number: TUIC-COI 17-200). All procedures performed in studies involving human participants were in accordance with the 1964 Helsinki Declaration and its later amendments.
: Because of the anonymous nature of the data, the requirement for informed consent and approval was waived.
