Hara, Yutaro
Miura, Takuya
Sakamoto, Yoshiyuki
Morohashi, Hajime
Nagase, Hayato
Hakamada, Kenichi
Article History
Received: 16 October 2019
Accepted: 5 April 2020
First Online: 28 April 2020
Ethics approval and consent to participate
: The protocol for this research project has been approved by a suitably constituted Hirosaki University Ethics Review Committee Board and it conforms to the provisions of the Declaration of Helsinki. Approval by the Hirosaki University Ethics Review Committee Board (2018–1131) was obtained for creation and use of this de-identified database for research purposes.
: Not applicable.
: The authors declare that they have no competing interests.