Funding for this research was provided by:
Universiti Putra Malaysia (UPM/700-2/1/GP-IPS/2018/9593800, UPM/800-3/3/1/GPB/2018/9659600, UPM/SPS/GS48750)
Received: 27 July 2020
Accepted: 30 November 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: The protocol was registered with the Medical Research and Ethics Committee, Ministry of Health Malaysia (NMRR-20-330-53097).
: We would like to thank the Director General of Health Malaysia for his permission to publish this article.
: The authors declare that they have no competing interests.