Funding for this research was provided by:
SingHealth Foundation (Health Services Research (Aging) Startup Grant SHF/HSRAg004/2015)
Singapore Health Services (Nurturing Clinician Scientist Award Academic Clinical Programme Funding FY 2016 Cycle 2.)
Received: 12 September 2018
Accepted: 12 June 2019
First Online: 20 June 2019
Ethics approval and consent to participate
: This study was approved for ethics with a waiver for patient consent by SingHealth Centralized Institutional Review Board (CIRB 2016/2294).
: Not applicable.
: The authors declare that they have no competing interests.