Funding for this research was provided by:
National Natural Science Foundation of China (81673224, 81273018, 30700654)
Natural Science Foundation of Shaanxi Province (2019JM029, 2015JM8436, 2018JM7135)
Science Funding of Health Department, Shaanxi Province (2012D58)
the Fundamental Research Funds for the Central University (XJJ 2011024)
the Project of Independent Innovative Experiment for Postgraduates in medicine in Xi’an Jiaotong University (YJSCX-2017-007, YJSCX-2018-011)
Received: 8 August 2019
Accepted: 5 November 2019
First Online: 27 November 2019
Ethics approval and consent to participate
: All procedures performed in this study involving were in accordance with the ethical standards of the Institutional Medical Ethics Committee of Xi’an Jiaotong University.
: Not applicable.
: The authors declare that they have no competing interests.