Funding for this research was provided by:
Ministry of Health, Labour and Welfare (2012–2014 Psychiatry – General - 001 (Reconstruction))
Received: 12 February 2020
Accepted: 1 June 2020
First Online: 11 June 2020
Ethics approval and consent to participate
: The study and surveys were approved by the institutional ethical committee of Kurihama Medical and Addiction Center (#2012181). This study was carried out in accordance with the Declaration of Helsinki. The interview survey was conducted for those who gave consent after explaining the purpose of the survey.
: Not applicable.
: The authors declare that they have no competing interests.