Received: 17 September 2019
Accepted: 12 October 2020
First Online: 16 November 2020
Ethics approval and consent to participate
: This study was approved by the National Medical Research Register (NMRR) with the registration number NMRR-16-2042-31954. The Medical Research and Ethics Committee (MREC) and Ministry of Health Malaysia have exempted this study from MREC approval.
: Not applicable.
: All authors disclose that there is no competing interest. All authors had no potential conflict of interest regarding the publication of this article.