Funding for this research was provided by:
Japan Society for the Promotion of Science (24243039)
Text and Data Mining valid from 2020-05-11
Received: 8 November 2019
Accepted: 5 May 2020
First Online: 11 May 2020
Ethics approval and consent to participate
: Data use was approved by Kure Municipal Authority for a secondary data analysis of anonymous data, and the internal review board approval was waived due to anonymous nature of the dataset.
: Not Applicable.
: None declared.