Funding for this research was provided by:
National Natural Science Foundation of China (81872148, 81874040)
National Key R&D Program of China (2017YFC1308600)
Text and Data Mining valid from 2019-08-13
Received: 4 May 2019
Accepted: 6 August 2019
First Online: 13 August 2019
Ethics approval and consent to participate
: Study protocols were approved by the Hospital Ethics Committee of Shandong University and written informed consent was obtained from patients based on the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.