Funding for this research was provided by:
Pusat Pengurusan Penyelidikan dan Instrumentasi (GUP UKM-2011-327)
Received: 28 January 2020
Accepted: 11 June 2020
First Online: 20 June 2020
: The Research Ethics Committee of Universiti Kebangsaan Malaysia Medical Centre (Approval reference no: UKM PPI.800-1/1/5/JEP-2019-415), Medical Research and Ethics Committee (MREC), Ministry of Health Malaysia (Reference no.: NMRR-11-1074-10,358) approved this study as well as the informed consent procedure (in 2012).
: Not applicable.
: The authors have no conflicting interests to declare.