Funding for this research was provided by:
National Natural Science Foundation of China (81502700)
Text and Data Mining valid from 2019-04-10
Received: 21 December 2018
First Online: 10 April 2019
Compliance with Ethical Standards
: The authors declare that they have no conflicts of interest.
: All procedures were performed in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study protocol received ethical approval from the Biomedical Ethics Committee of Xi’an Jiaotong University Health Science Center (reference 2015-170).
: Written informed consent was obtained from all patients included in the study, prior to data collection.