Liu, Helena http://orcid.org/0000-0002-4211-0932
Article History
Received: 26 February 2017
Accepted: 29 June 2017
First Online: 6 July 2017
Compliance with Ethical Standards
:
: The author, Helena Liu, declares that she has no conflict of interest.
: Subjects have given their informed consent and the study protocol has been approved by the institute’s committee on human research.