Guo, Huafang
Zhou, Hezheng
Article History
Received: 20 April 2017
Accepted: 25 August 2018
First Online: 4 September 2018
Compliance with ethical standards
:
: The authors declare no conflict of interest.
: This descriptive study was objectivity and transparency in research and accepted principles of ethical and professional conduct have been followed. All the co-authors of this paper have no financial interest in relation to the submission.
: Human participants in this research have given informed consent.