Received: 12 July 2020
Accepted: 28 October 2020
First Online: 7 November 2020
Ethics approval and consent to participate
: This study was approved by the Ethical Research Committee, Iwate Medical University. All procedures were performed in accordance with the ethical standards of Iwate Medical University and with the Declaration of Helsinki. An alternative of informed consent (approved by the Institutional Review Board of Iwate Medical University) was obtained from all patients included in the study.
: Not applicable.
: The authors declare that they have no competing interests.