Funding for this research was provided by:
Japan Society for the Promotion of Science (JP 17H02612)
Received: 30 January 2020
Accepted: 8 May 2020
First Online: 20 May 2020
Ethics approval and consent to participate
: The ethics committee at St. Marianna University School of Medicine approved this study (No. 3695). Before the interviews, the written informed consents were obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.