Takeya, Aya http://orcid.org/0000-0003-2644-8383
Adachi, Emi
Takahashi, Yoshimitsu
Kondoh, Eiji
Mandai, Masaki
Nakayama, Takeo
Article History
Received: 13 May 2019
Accepted: 5 March 2020
First Online: 17 March 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national 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.
: Although retrospective studies are conducted on already available data or biological material (for which formal consent may not be needed or is difficult to obtain) ethical approval may be required dependent on the law and the national ethical guidelines of a country. Authors should check with their institution to make sure they are complying with the specific requirements of their country.