Funding for this research was provided by:
Ministry of Social and Family Development, Singapore
National Medical Research Council (NMRC-STAR-0005-2009, NMRC-CNIG-1124-2014)
Duke-NUS Medical School Geriatric Research Fund
Accepted: 7 December 2020
First Online: 13 January 2021
Compliance with ethical standards
: The authors declare that they have no conflict of interest.