Text and Data Mining valid from 2019-11-06
Received: 27 May 2019
Accepted: 13 September 2019
First Online: 6 November 2019
Ethics approval and consent to participate
: This study was approved by the ethics review board of Shinshu University School of Medicine (Approval Number: 2652), and consent for research participation was deemed to be waived.
: Not applicable.
: The authors declare that they have no competing interests.