Liu, J. Sherry
Foo, Denise
Yeo, Tseng Tsai
Ho, Kee Hang
Nga, Vincent Diong Weng http://orcid.org/0000-0001-5256-5669
Karlsson, Bengt
Article History
Received: 25 April 2018
Accepted: 2 April 2019
First Online: 17 April 2019
Compliance with ethical standards
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.
: The authors declare that they have no conflict of interest.