Funding for this research was provided by:
Japan Agency for Medical Research and Development
Text and Data Mining valid from 2019-03-11
Received: 21 February 2019
Accepted: 22 February 2019
First Online: 11 March 2019
Compliance with ethical standards
: The author has no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.