Received: 6 May 2019
Accepted: 18 January 2020
First Online: 3 February 2020
Ethics approval and consent to participate
: This study was under ethics review, oversight, and governance both in Greece and in the United States by the International Organization for Migration Greek research ethics advisory board and the Institutional Review Board of the Harvard T. H. Chan School of Public Health (Protocol IRB16-2015), respectively. Informed consent was obtained orally from all participants to avoid the potential risks of collecting participant names.
: All authors have approved the manuscript for publication.
: The authors declare that they have no competing interests.