Funding for this research was provided by:
National Medical Research Council (NMRC/STaR/0015/2013)
National Research Foundation Singapore (NRF2016-SOL002-001)
Article History
First Online: 20 August 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: This study was approved by the National University of Singapore Institutional Review Board, was conducted in accordance with the ethical standards of the 1964 Helsinki declaration and its later amendments.
: Written informed consent was obtained from all participants prior to participation. Volunteers below 18 years of age additionally obtained parental consent to participate in this research.