Funding for this research was provided by:
Health Labour Sciences Research of the Ministry of Health, Labour and Welfare, Japan (#H24YA003)
Text and Data Mining valid from 2019-01-24
Received: 10 May 2018
Accepted: 17 January 2019
First Online: 24 January 2019
Ethics approval and consent to participate
: The study protocol was approved by the Institutional Review Board of the Nagoya University Graduate School of Medicine (Approval no. 2012–0166) and followed the guidelines of the Declaration of Helsinki. All participants agreed to give written informed consents.
: not applicable.
: The authors declare that they have no competing interests.
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