Funding for this research was provided by:
Japan Agency for Medical Research and Development (16ck0106058h0003)
National Cancer Center Research and Development Fund (26-A-27)
Ministry of Health, Labour and Welfare of Japan (H26-055)
Text and Data Mining valid from 2018-08-15
Received: 20 April 2018
Accepted: 1 August 2018
First Online: 15 August 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in this study which involved human participants were in accordance with the ethical standards of the institutional national research committee and with the 1964 Helsinki declaration and its later amendments are comparable ethical standards.