Funding for this research was provided by:
Defense Threat Reduction Agency
Received: 11 July 2019
Accepted: 13 February 2020
First Online: 21 February 2020
Ethics approval and consent to participate
: The research protocol used in this study was approved by the Sierra Leone Ethics and Scientific Review Committee and the institutional review boards of the US Naval Research Laboratory (NRL.2012.0007) and George Mason University (477605).
: Not applicable.
: The authors declare that they have no competing interests.