Funding for this research was provided by:
The present study was supported by grants from the National Natural Science Foundations of China (31700720)
,Project of Chengguan District Science and Technology Bureau of Lanzhou city (2017SHFZ0029)
Lanzhou University Innovation and Entrepreneurship Cultivation Promgram (Lanzhou University Innovation and Entrepreneurship Cultivation Promgram)
the Fundamental Research Funds for the Central (lzujbky-2018-59)
Text and Data Mining valid from 2020-01-29
Received: 24 July 2019
Accepted: 5 January 2020
First Online: 29 January 2020
Ethics approval and consent to participate
: The study was approved by the institutional research ethics committee of The Second Hospital of Lanzhou University.
: If this article is accepted, we will agree to publish it and transfer the copyright to academic journals and your publishing company.
: The authors declare that they have no competing interests.