Funding for this research was provided by:
Ministry of Education, Malaysia (LR0002D-2018)
Received: 20 November 2020
Accepted: 17 March 2021
First Online: 25 March 2021
: Ethics approval was obtained from the Medical Research and Ethics Committee (MREC) of the Ministry of Health Malaysia (NMRR-15-672-23975) and the Medical Ethics Committee of University of Malaya Medical Centre (MEC Ref. No. 817.1).
: Not applicable.
: MYL, CHO and YLL have no competing interests.