Funding for this research was provided by:
Qingdao Applied Basic Research Source Innovation Plan (17-1-1-43-jch)
National Natural Science Fund (81602271)
the Key Research and Development Project of Shandong Province (2017GSF218108)
Text and Data Mining valid from 2019-06-11
Received: 11 December 2018
Accepted: 4 June 2019
First Online: 11 June 2019
Ethics approval and consent to participate
: This work was approved by the Ethical Committee of Qilu Hospital of Shandong University. All subjects signed the informed consent.
: Not applicable.
: The authors declare that they have no competing interests.