Funding for this research was provided by:
Japan Society for the Promotion of Science (15K08920)
Text and Data Mining valid from 2019-12-01
Received: 17 July 2019
Accepted: 3 December 2019
First Online: 23 December 2019
Ethics approval and consent to participate
: This study received approval from the Kyushu University Research Ethics Committee (No. 28-20). Informed consent is not necessary for this type of study.
: Not applicable.
: Shu Takakura, Chie Suzuyama Asou, Tomokazu Hata, Makoto Yamashita, and Nobuyuki Sudo declares that they have no competing interests.