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Article History

Received: 12 August 2017

Accepted: 30 May 2018

First Online: 9 June 2018

Compliance with ethical standards

:

: All procedures performed in the present study were in accordance with the ethical standards of the institutional review boards of Japanese Red Cross Himeji Hospital (IRB approval number 2016-18) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

: Informed consent was obtained from all individual participants included in the study.

: The authors declare that no conflicts of interest exist.