Received: 5 February 2021
Accepted: 19 November 2021
First Online: 6 December 2021
: This systematic review protocol was registered with the National Medical Research Register (NMRR-20-1810-56054), Ministry of Health Malaysia. Ethical approval was sought from the Health Medical Research Ethics Committee (MREC), Ministry of Health Malaysia, on 9 September 2020.
: Not applicable.
: The authors declare that they have no competing interests.