Received: 11 April 2019
Accepted: 10 June 2019
First Online: 26 June 2019
Ethics approval and consent to participate
: The authors assert that all procedures contributing to this work, including consent procedures, comply with the ethical standards of the relevant national and institutional committees on human experimentation and with the Helsinki Declaration of 1975, as revised in 2008. The protocol and data collection for this research was approved by the New York University School of Medicine Institutional Review Board 06–631; the United Nations High Commissioner for Refguees in Abeche, Chad; and the Council of Chiefs of Bredjing and Treguine refugee camps, Chad.
: Not applicable.
: The authors declare that they have no competing interests.