Funding for this research was provided by:
Chinese Scholarship Council
Article History
Accepted: 21 June 2018
First Online: 4 July 2018
Compliance with ethical standards
:
: The authors can confirm that there are no conflicts of interest to declare.
: All the authors confirm that the research was approved by the Human Research Ethics Administration at the University of Newcastle and have therefore been performed in accordance with ethical standards laid down in the 1964 Declaration of Helsinki.
: Informed consent was obtained from all individual participants included in the study.