Funding for this research was provided by:
Pusat Pengurusan Penyelidikan dan Instrumentasi (GUP 2011 327)
Received: 18 February 2019
Accepted: 28 January 2020
First Online: 18 February 2020
Ethics approval and consent to participate
: The Research Ethics Committee of Universiti Kebangsaan Malaysia Medical Centre (Approval reference no: 188.8.131.52/244/UKM-GUP-2011-327), National Institutes of Health Malaysia, Medical Research and Ethics Committee (MREC), Ministry of Health Malaysia approved this study as well as the informed consent procedure (in 2012). Informed written consent to participate in this study was obtained from all participants.
: Not applicable.
: The authors declare they have no competing interests.