Received: 3 February 2021
Accepted: 1 July 2021
First Online: 14 July 2021
: Universiti Kebangsaan Malaysia Research Ethics Committee (UKM 41 PPI/111/8/JEP-2018-340), the Medical Ethics Committee of Faculty of Dentistry University Malaya (DF OS1913/0051(L)) and University Malaya Medical Centre (UMMC) Medical Research Ethics Committee (MREC ID NO: 2019611-7512).
: Not applicable.
: The authors declare that they have no competing interests.