Funding for this research was provided by:
Ministry of Education, Culture, Sports, Science and Technology (15H05006, 19K09393)
Text and Data Mining valid from 2020-05-11
Received: 4 February 2020
Accepted: 22 April 2020
First Online: 11 May 2020
Ethics approval and consent to participate
: The Ethics Committee of Kyoto University and each participating institution approved this study protocol (R1045), and written informed consent was waived.
: Not applicable
: The authors declare that they have no competing interests.