Received: 13 March 2019
Accepted: 20 March 2020
First Online: 3 April 2020
Ethics approval and consent to participate
: Our study protocol conformed to the ethical standards of the responsible committees on human experimentation (institutional and national) and with the Declaration of Helsinki in 1964 and later versions and was approved by the Institutional Review Board of Hiroshima University Hospital. In this study, we only used clinical information without invasion or intervention to the patient, and we disclosed information such as research implementation and purpose and secured participants’ opportunity to refuse participation through posters.
: Not applicable.
: The authors declare that they have no competing interests.