Funding for this research was provided by:
Australian Research Council Centre of Excellence in Population Ageing Research (CE1701005)
Received: 30 October 2020
Accepted: 11 October 2021
First Online: 30 October 2021
: The research was approved by the Research Ethics Committee of the Mongolian National University of Medical Sciences (2017/3-08). Written consent was obtained from study participants.
: Not applicable.
: The authors declare that they have no competing interest.