Text and Data Mining valid from 2018-07-24
Received: 22 June 2018
Accepted: 16 July 2018
First Online: 24 July 2018
Ethics approval and consent to participate
: Ethical approval was obtained from the Faculty of Health Sciences Institutional Review Board, University of Buea (reference number: 2012–11-0089) and all participants provided written informed consent prior to recruitment to the study.
: Not applicable.
: The authors declare that they have no competing interests.
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