Received: 7 February 2021
Accepted: 5 May 2021
First Online: 1 June 2021
: The NHMS 2019 was registered under the National Medical Research Registry (NMRR) with registration identification NMRR-18-3085-44207. Medical Research Ethics Committee (MREC) Malaysia reviewed and approved the study protocol [KKM/NIHSEC/P18–2325(11)] and the fieldwork was carried out in accordance to the Declaration of Helsinki. Informed consent was obtained prior to the interview.
: Not applicable.
: The author(s) declared no conflicts of interest with respect to the research, authorship, and/or publication of this article.