Received: 24 May 2018
Accepted: 22 November 2018
First Online: 3 December 2018
Ethics approval and consent to participate
: The subjects gave informed consent while the study design was approved by the Nnamdi Azikiwe University Teaching Hospital (NAUTH) Ethics Committee. (Ref: NAUTH/CS/66/VO.4/61.
: Not applicable.
: The authors declare that they have no competing interests.
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