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First Online: 25 November 2019
Compliance with Ethical Standards
: This study was conducted after being granted approval by the Seiwakai Ethics Committee.
: All procedures performed in the present study were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The authors declare that they have no conflict of interest.
: Informed consent was obtained from all individual participants included in the study.
