Funding for this research was provided by:
National Natural Science Foundation of China (81771397, 81701271)
Text and Data Mining valid from 2018-12-12
Received: 7 August 2018
Revised: 1 November 2018
Accepted: 2 November 2018
First Online: 12 December 2018
Compliance with ethical standards
: The authors declare that there is no conflict of interest.
: The Ethics Committee of the First Affiliated Hospital of Zhengzhou University approved this study (Number: KW-2018-LW-006).
: All subjects gave their informed consent prior to their inclusion in the study.