Received: 30 July 2020
Accepted: 11 December 2020
First Online: 4 January 2021
Ethics approval and consent to participate
: The Ethical Committee of Dalian Medical University approved this study. Written informed consent was obtained from each participant in our study. All patients were informed of the purpose of the study and the manner in which the results would be presented before the investigation. They were also informed that they could remove themselves from the investigation at any time and were assured that all their information would remain confidential.
: Not applicable.
: The authors declare that they have no competing interests.