Funding for this research was provided by:
Ministry of Education, Culture, Sports, Science and Technology
Japan Agency for Medical Research and Development
Japan Society for the Promotion of Science (JP16K16333)
Text and Data Mining valid from 2018-06-18
Received: 23 October 2017
Accepted: 7 June 2018
First Online: 18 June 2018
Ethics approval and consent to participate
: Our survey was out of the scope of Japanese national Ethical Guidelines for Medical and Health Research Involving Human Subjects and we have no national guidelines for social and behavioral research. Thus, our study was carried out in accordance with the Ethical Principles for Sociological Research by the Japan Sociological Society, which doesn’t require ethical reviews. After being informed about the purposes of this study and the outline of questions, participants agreed to respond the survey. Completion of answering all of the questionnaire was regarded as consent to this study by participants. Potential participants were informed about this procedure before starting the questionnaire. The right not to participate or to withdraw from this survey was guaranteed by not answering the survey.
: Not applicable.
: The authors declare that they have no competing interests.
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