He, C. http://orcid.org/0000-0002-4113-0886
Lu, J. http://orcid.org/0000-0001-9502-2306
Ong, M. W. http://orcid.org/0000-0003-1518-7456
Lee, D. J. K. http://orcid.org/0000-0002-0741-5386
Tan, K. Y. http://orcid.org/0000-0003-3077-718X
Chia, C. L. K. http://orcid.org/0000-0003-2248-9348
Article History
Received: 4 August 2019
Accepted: 17 November 2019
First Online: 29 November 2019
Compliance with ethical standards
:
: All authors declare no conflict of interest.
: This study design conformed to ethical standards.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: There were no individual participants included in this study.