Funding for this research was provided by:
National Medical Research Council (R-184-006-184-511)
Received: 3 July 2018
Accepted: 11 October 2018
First Online: 6 November 2018
Ethics approval and consent to participate
: This study was conducted in accordance with the Declaration of Helsinki, and written informed consent was obtained from both the patients and the patients’ caregivers. Ethics approval was granted by the National Healthcare Group Review Board of Singapore (NUHS1288/2010).
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.