Funding for this research was provided by:
Shandong Medical and Health Technology Development Plan Project (2017WSB832)
Shandong Provincial Higher Education Research and Development Program (J18KB069)
Article History
Received: 14 June 2020
Accepted: 9 July 2020
First Online: 18 July 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was approved by Ethical Committee of the Affiliated Yantai Yuhuangding Hospital of Qingdao University and conducted in accordance with the ethical standards.
: Yes.