Funding for this research was provided by:
Japan Society for the Promotion of Science (JP15K03296)
Received: 6 April 2018
Accepted: 8 November 2018
First Online: 21 November 2018
Ethics approval and consent to participate
: The protocols and survey content in this study were reviewed and approved by the Teikyo University Ethics Committee (No.16–092). The questionnaire was administered to only those who consented to participate in the study. (see Additional file InternalRef removed).As this was an Internet survey, the data were anonymized to prevent tracking. Further, questions examining matters of individual privacy (e.g., income, family structure) were made optional out of ethical considerations, further protecting the voluntariness and ethicality of participation.
: Not applicable
: The authors declare that they have no competing interests.
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