Text and Data Mining valid from 2019-06-03
Received: 13 December 2018
Accepted: 24 May 2019
First Online: 3 June 2019
Ethics approval and consent to participate
: The Kanazawa University ethics committee approved this study (Approval number: 1947). Written informed consent was obtained from each subject.
: Not applicable.
: The authors declare that they have no competing interests.