Funding for this research was provided by:
Korea International Cooperation Agency (P2014-00038)
Received: 15 June 2018
Accepted: 4 July 2018
First Online: 11 July 2018
Ethics approval and consent to participate
: This study was approved by the institutional review board of the Addis Ababa University College of Health Sciences institutional review board, Ethiopia (032/17/SPH). All participants gave written informed consent to participate.
: Not applicable.
: The authors declare that they have no competing interests.
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