Funding for this research was provided by:
Ministry of Higher Education, Malaysia (FRGS/1/2018/SS03/UKM/03/2)
Text and Data Mining valid from 2019-07-03
Received: 28 December 2018
Accepted: 8 April 2019
First Online: 3 July 2019
Ethics approval and consent to participate
: The study was approved by the Medical Research and Ethics Committee of Malaysia’s Ministry of Health (reference number, NMRR-17-720-34,389 (IIR)).
: Not applicable.
: The authors declare that they have no competing interests.
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