Funding for this research was provided by:
National Natural Science Foundation of China (81400957)
Medical and Health Technology Development Project of Shandong (2016WSA10008)
Article History
Received: 24 February 2020
Accepted: 8 July 2020
First Online: 13 July 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was approved by the institutional Ethics Board Committee of the Weihai Central Hospital. All participants provided written informed consent to participate in the study.