Received: 25 June 2020
Accepted: 4 September 2020
First Online: 17 September 2020
Ethics approval and consent to participate
: All procedures followed were in accordance with the ethical standards of the Iwate Medical University and with the Helsinki Declaration. Substitute for informed consent (approval of the institutional review board of Iwate Medical University) was obtained from all patients for being included in the study, as below: This study was approved by the institutional review board of Iwate Medical University (H29–78 and HGH29–17; approval date August 16, 2017).
: Not applicable.
: The authors declare no competing financial interests.