Funding for this research was provided by:
Key Technology Research and Development Program of Shandong (2015GGH318015; 2019GSF108207)
National Natural Science Foundation of China (81270598, 81770210, 81473486)
Text and Data Mining valid from 2019-11-27
Received: 24 May 2019
Accepted: 25 October 2019
First Online: 27 November 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Ethics Review Board of Shandong Provincial Hospital affiliated to Shandong University, Shandong, China. All participants provided written informed consent before enrolment.
: All participants have read and approved for the manuscript.
: The authors declare that they have no competing interests.