Funding for this research was provided by:
Natural Science Foundation of Shaanxi Province (2018SF-245)
Fundamental Research Funds for the Central Universities (1191329109)
Text and Data Mining valid from 2020-01-16
Received: 11 October 2019
Accepted: 26 November 2019
First Online: 16 January 2020
Compliance with ethical standards
: The authors have no conflicts of interest to declare.
: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions. Informed consent was obtained from all patients for being included in the study.