Funding for this research was provided by:
University Malaya Research Grant (RG506-13HTM)
Received: 28 May 2020
Accepted: 2 September 2020
First Online: 7 September 2020
Ethics approval and consent to participate
: This study was approved by the Medical Research and Ethics Committee of the Ministry of Health Malaysia (reference no NMMR-14-1527-21690 (IIR) and conformed with the ethical regulations of the World Medical Association and the Declaration of Helsinki. Written informed consent was obtained from the patients prior to their participation in the study.
: Not applicable.
: The authors declare no conflict of interest.