Funding for this research was provided by:
Natural Science Foundation of Guangdong Province (2018A030310060)
PhD Initial Foundation of Hospital (20170916)
Article History
Received: 22 September 2018
Accepted: 14 November 2018
First Online: 29 November 2018
Compliance with ethical standards
:
: Wan bin Yang declares that he has no conflict of interest. Xiu li Gong declares that she has no conflict of interest. Xiu lian Wang declares that she has no conflict of interest. Chao Huang declares that he has no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: For this type of study, formal consent is not required.