Funding for this research was provided by:
City University of Hong Kong (9610403)
Received: 21 October 2020
Accepted: 8 February 2021
First Online: 17 February 2021
Ethics approval and consent to participate
: The study was approved by the Human Subjects Ethics Sub-committee of the affiliated university (Reference no.: 3–4-201809_01 and B-PhD-202003-02). Written and oral informed consent form was obtained from all participants.
: Not applicable.
: Dannii Yeung is an Editorial Board member for BMC Geriatrics. The other authors declare that they have no competing interests.