Funding for this research was provided by:
the Shaanxi province science and technology research projects (2016SF-122)
the First Affiliated Hospital of Xi?an Jiaotong University clinic research projects (XJTU1AHCR2014-032)
Article History
Received: 8 November 2018
Accepted: 31 December 2018
First Online: 28 January 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.