Funding for this research was provided by:
Text and Data Mining valid from 2019-11-29
Received: 25 September 2019
Accepted: 13 November 2019
First Online: 29 November 2019
: This study was conducted in accordance with the Declaration of Helsinki. Approval was obtained from the Oita University animal research committee prior to animal experimentation (Oita University institutional Animal Ethics Committee no.1624002).
: Not applicable.
: The authors declare that they have no competing interests.