Funding for this research was provided by:
Ministry of Health and Welfare (HI13C0715)
Text and Data Mining valid from 2020-03-16
Received: 26 October 2019
Accepted: 26 February 2020
First Online: 16 March 2020
Ethics approval and consent to participate
: The study protocol was approved by our institution’s ethics committee, and informed consent for the procedure was obtained from each participant.
: Not applicable.
: The authors declare that they have no competing interests.