Funding for this research was provided by:
Natural Science Foundation of Shandong Province (2016ZDJS07A09)
Received: 15 July 2019
Accepted: 17 April 2020
First Online: 4 May 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Review Committee of Shandong University Second Hospital and informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.