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Article History

Received: 12 February 2018

Accepted: 7 June 2018

First Online: 19 June 2018

Ethics approval and consent to participate

: The study was approved by the Human Research Ethics committee of North-West University (NWU-0044-10-A1). Participants were asked to read and sign the informed consent if they agree to participate in the study.

: Consent for publication of anonymous personal and testing data was obtained as part of the informed consent for the study.

: The authors declare that they have no competing interests.

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