Funding for this research was provided by:
National University Health Systems Pte Ltd (SBRO14/NS01G)
Received: 8 March 2018
Accepted: 18 June 2019
First Online: 29 July 2019
Ethics approval and consent to participate
: The investigations were carried out in accordance with the ethical codes and guidelines of the Nuremberg Code (1946), the Declaration of Helsinki (1964), the Belmont Report (1979) and the Singapore Guideline for Good Clinical Practice (1998), and were approved by the National Healthcare Group Domain Specific Review Board (Reference Number: NHG DSRB 2014/00034), including waiver of informed consent.
: Not applicable.
: The authors declare that that they have no competing interests.