First Online: 31 May 2021
: Ethical approvals of the study were obtained from the Medical Research Ethics Committee (MREC), Ministry of Health Malaysia (NMRR-17-423-34969) and Queen Mary (University of London) Research Ethics Committee (MR/P012590/1) prior to conducting the study. Informed written consent was obtained from all respondents before the start of study.
: Not applicable.
: The authors declare that they have no competing interests.