Funding for this research was provided by:
Natural Science Foundation of Shaanxi Province (2017JM8099)
Second Affiliated Hospital, Xi’an Jiaotong University (YJ(ZD)201705)
Text and Data Mining valid from 2019-03-20
Received: 23 August 2018
Accepted: 5 March 2019
First Online: 20 March 2019
Compliance with Ethical Standards
: The Ethics Committee of the Health Science Center of Xi’an Jiaotong University approved the study.
: The authors declare that they have no conflicts of interest.