Funding for this research was provided by:
Grant-Aid for Scientific Research grants from the Japan Society for the Promotion of Science (26861184)
Text and Data Mining valid from 2019-05-17
Received: 5 September 2018
Accepted: 2 May 2019
First Online: 17 May 2019
Ethics approval and consent to participate
: Ethics were approved by the institutional review board of the Mie University Hospital (Tsu, Mie, Japan; IRB reference number: 3083). Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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