Funding for this research was provided by:
Nanyang Technological University (M4081570.100)
Received: 20 February 2019
Accepted: 17 June 2019
First Online: 8 July 2019
Ethics approval and consent to participate
: This study has been approved by the institutional review board of Nanyang Technological University Singapore (IRB201504021). Written informed consent is obtained from all participants before study participation. Participants’ confidentiality is safeguarded under this ethical provision.
: Not applicable.
: The authors declare that they have no competing interests.