Received: 28 April 2020
Accepted: 17 August 2020
First Online: 24 August 2020
Ethics approval and consent to participate
: The Ethical Committee of Dalian Medical University approved this study. Before the investigation, the patients were informed of the purpose of the study and the presentation of the results, and they were assured that their personal information would not be disclosed. All patients signed informed consent forms in our study.
: Not applicable.
: The authors declare that they have no competing interests.