Funding for this research was provided by:
National Natural Science Foundation of China (81071371)
Text and Data Mining valid from 2019-06-03
Received: 28 March 2019
Accepted: 24 May 2019
First Online: 3 June 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the First Affiliated Hospital of Xi’an Jiaotong University.
: All authors approved the final manuscript.
: The authors declare that they have no competing interests.