Document is current

Article History

Received: 25 June 2019

Accepted: 5 January 2020

First Online: 13 January 2020

Compliance with ethical standards

:

: Hisamitsu Zaha declares that he/she has no conflict of interest. Tokiwa Motonari declares that he/she has no conflict of interest. Norie Abe declares that he/she has no conflict of interest. Mikiko Unesoko declares that he/she has no conflict of interest.

: All procedures performed in studies involving human participants 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.

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