Funding for this research was provided by:
Innovative Research Group Project of the National Natural Science Foundation of China (81471742, 91748105)
Fundamental Research Funds for the Central Universities (DUT2019)
China Scholarship Council (201806060038)
Received: 28 January 2020
Accepted: 9 June 2020
First Online: 31 July 2020
Ethics approval and consent to participants
: This study was approved by the Ethics Committee of Dalian Medical University in accordance with the Declaration of Helsinki. All participants provided written informed consent following an explanation of the nature of the study.
: Not applicable.
: The authors declare no conflict of interest.