Funding for this research was provided by:
Ministry of Health, Labour and Welfare (H30-statistics-general-003)
Text and Data Mining valid from 2020-01-30
Received: 18 October 2019
Accepted: 14 January 2020
First Online: 30 January 2020
Ethics approval and consent to participate
: This study was approved by the Research Ethics Board of Fujita Health University. All participants provided written informed consent.
: Not applicable.
: The authors declare no conflict of interest in conducting this research.