Funding for this research was provided by:
Health and Labour Sciences Research Grant from the Ministry of Health, Labour and Welfare, Japan (H27-iryo-ippan-001, 2015; H28-seisaku-sitei-009, 2016)
Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science ((A) 16H02634, 2014)
Text and Data Mining valid from 2018-12-01
Received: 1 October 2018
Accepted: 3 December 2018
First Online: 18 December 2018
Ethics approval and consent to participate
: This study was performed with the approval of the ethics committee of Kyoto University (approval number: R0135).
: Not applicable.
: All authors declared that they had no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.