Funding for this research was provided by:
Seventh-day Adventist Church
Received: 4 December 2017
Accepted: 15 March 2018
First Online: 3 April 2018
Ethics approval and consent to participate
: The study was approved by the Avondale College of Higher Education Human Research Ethics Committee (No:2011:21), and participation in the study was voluntary and anonymous. Written informed consent was collected from parents or guardians and students.
: Not applicable.
: The authors declare that they have no competing interests.
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