Funding for this research was provided by:
University of Malaya Research Grant (RP009A)
Received: 1 October 2018
Accepted: 10 October 2019
First Online: 22 October 2019
Ethics approval and consent to participate
: UM Ethics Approval (20146-331). All protocols and procedures were approved by the Medical Ethics Committee of University Malaya Medical Centre. All participants provided their written informed consent prior to the commencement of the study.
: Not applicable.
: The authors declare that they have no competing interests.