Funding for this research was provided by:
Regional Office for the Eastern Mediterranean/World Health organization (RPC/RAB&GH 10/11-03)
Received: 16 March 2017
Accepted: 22 February 2018
First Online: 27 February 2018
Ethics approval and consent to participate
: The study protocol was approved by the Ethical Committee of Pasteur Institute of Morocco, and written informed consent was obtained from each study subject.
: Not applicable
: The authors declare that they have no competing interests.
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