Funding for this research was provided by:
Ministry of Higher Education, Malaysia (FRGS0322-SG-1/2013)
Received: 16 July 2020
Accepted: 16 October 2020
First Online: 22 October 2020
Ethics approval and consent to participate
: Informed verbal consent was obtained from the patients and ethical approval for this study was obtained from the Ethics Committee of University of Malaya Medical Centre (reference no. 709.2).
: Not applicable.
: The authors declare that they have no competing interest.