Funding for this research was provided by:
Ministry of Helath, Labour and Welfare (H27-Itami-Shitei-001)
Text and Data Mining valid from 2019-07-22
Received: 22 April 2019
Accepted: 9 July 2019
First Online: 22 July 2019
Ethics approval and consent to participate
: All study procedures were in accordance with the ethical standards of the Helsinki Declaration of 1975, as revised in 2013. The Juntendo University Faculty of Medicine Institutional Review Board (No.17–126) approved this study on 16 November, 2017. All respondents provided informed consent before completing the questionnaires.
: All respondents provided consent to publish before completing the questionnaires.
: The authors declare that they have no competing interests.