Received: 9 April 2020
Accepted: 12 November 2020
First Online: 18 November 2020
Ethics approval and consent to participate
: The experimental protocol and informed consent were approved by the Institutional Review Board of our hospital-Qilu Hospital of Shandong University. And all patients involved in this study gave their informed consent verbally. Since our research was a retrospective one and we just collected patients’ data retrospectively without any intervention that could influence patients’ clinical outcome.
: Not applicable.
: We declare that there are no conflicts of interest to the manuscript submitted. We do not have any commercial or personal relationships with other people or organizations in connection with our work.