Funding for this research was provided by:
Ministry of Education Malaysia (LRGS/BU/2012/UKM-UKM/K/01)
Received: 24 September 2020
Accepted: 22 February 2021
First Online: 2 March 2021
: This study is a part of LRGS-TUA longitudinal study, approved by the Medical Research and Ethics Committee of Universiti Kebangsaan Malaysia (UKM 188.8.131.52/244/NN-060-2013). Written informed consent was obtained from study participants. In the case of participants with cognitive decline and not capable of providing ethical consent, informed consent was obtained from their legal guardian, family, or caregiver on their behalf.
: Not applicable.
: The authors declare that they have no competing interests.