Funding for this research was provided by:
Korea Institute for National Unification (N/A)
Received: 12 January 2020
Accepted: 2 June 2020
First Online: 29 June 2020
Ethics approval and consent to participate
: I am writing to declare that this collaborative manuscript was approved by the Dankook University Institutional Review Board (IRB) in Seoul, Korea and, as secondary data analysis, by IRB of the Johns Hopkins Bloomberg School of Public Health in Baltimore, Maryland. Following IRB guideline, the study objectives, the significance of the study, and potential risks of participation or non-participation were explained, and written consent was obtained prior to the interviews.
: While written consent obtained prior to the interviews, the consent for publication was also obtained from interviewees following the IRB guideline in South Korea.
: The authors declare that they have no competing interests.