Received: 29 August 2019
Accepted: 4 November 2019
First Online: 28 November 2019
Ethics approval and consent to participate
: Written informed consent was obtained from each participant. The study was approved by the Medical Research and Ethics Committee of the Malaysian Ministry of Health (Reference: (CitationRef removed) KKM/NIHSEC/P16–971 for NMRR-16-763-30060 (IIR)).
: Not applicable.
: The authors declare that they have no competing interests