Funding for this research was provided by:
National Natural Science Foundation of China (81670489)
Key Technology Research and Development Program of Shandong (2017CXGC1215)
Received: 3 July 2019
Accepted: 28 November 2019
First Online: 9 December 2019
Ethics approval and consent to participate
: The protocol of this study was approved by the local Ethical Committee of the Qilu Hospital of Shandong University (NCT02428426). All volunteers received information concerning their participation in the study and gave written informed consent.
: Not applicable.