Funding for this research was provided by:
Text and Data Mining valid from 2019-07-16
Received: 5 April 2019
Accepted: 11 July 2019
First Online: 16 July 2019
Ethics approval and consent to participate
: All procedures were approved by the ethics committee of the Faculty of Health and Welfare at Prefectural University of Hiroshima and were consistent with the Declaration of Helsinki. Written informed consent was obtained from the subject.
: The authors declare that they have no competing interests.