Funding for this research was provided by:
KAKENHI Grant-in-Aid (Young Scientists (B) 25862106)
Received: 18 April 2018
Accepted: 22 May 2019
First Online: 17 June 2019
Ethics approval and consent to participate
: All respondents in the survey received an information letter in which we emphasized that participation was voluntary, they could withdraw from the study without reason, and data would be anonymous. The Hamamatsu University School of Medicine’s Institutional Review Board approved this research (E14–347).
: Not applicable.
: The authors declare that they have no competing interests.