Funding for this research was provided by:
National Natural Science Foundation of China (81501569)
Article History
Received: 10 November 2018
Accepted: 2 February 2019
First Online: 8 February 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were 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. This study was approved by the Ethics Committee and Medical Records Management Section of the he First Affiliated Hospital of Zhengzhou University.
: Informed consent was obtained from all individual participants included in the study.