Funding for this research was provided by:
National Natural Science Foundation of China (81572191, 81170794)
Natural Science Foundation of Shandong Province (2019GSF108029)
Text and Data Mining valid from 2020-04-19
Received: 1 February 2020
Accepted: 12 April 2020
First Online: 19 April 2020
Ethics approval and consent to participate
: Written informed consent was obtained from all subjects. The study was performed in compliance with the guidelines for the Declaration of Helsinki and was approved by medical ethics regulations of the Medical Ethical Committee of Qilu Hospital of Shandong University (Jinan, China).
: All authors agree to publication, and there are no permissions needed<b>.</b>
: The authors declare that they have no competing interests.