Funding for this research was provided by:
The Japan Agency for Medical Research and Development, AMED
Text and Data Mining valid from 2018-01-12
Received: 5 October 2017
Accepted: 24 December 2017
First Online: 12 January 2018
Compliance with ethical standards
: All authors have declared that no conflict of interest exists.
: All procedures performed in studies involving human participants were performed in accordance with the ethical standards of the institutional and/or national research committee at which the studies were conducted (Fukushima Medical University; IRB Approval Number #1485, #2771) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: This study was performed according to Ethical Guidelines for Medical and Health Research Involving Human Subjects enacted by MHLW of Japan [ExternalRef removed and ExternalRef removed]. In the context of the guideline, the investigators shall not necessarily be required to obtain informed consent, but we made public information concerning this study on the web [ExternalRef removed] and ensured the opportunities for the research subjects to refuse use of their personal information.