Received: 27 July 2018
Accepted: 30 June 2019
First Online: 8 July 2019
Ethics approval and consent to participate
: Verbal informed consent was obtained from all participants. The Institutional Review Board of Columbia University and the Institutional Ethical Commission of the Catholic University of Bukavu (DRC) provided ethical approval for this study (IRB-AAAQ7431).
: Not applicable.
: The authors declare that they have no competing interests.