Received: 28 September 2020
Accepted: 30 November 2020
First Online: 9 December 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of the Third Hospital of Hebei Medical University (no. K20190031) and was conducted in accordance with the Declaration of Helsinki. As this was a retrospective study and all patient information was deidentified before analysis, informed consent was only required for the patients whose radiological images were selected for publication.
: Written informed consent was obtained from the participants whose radiological data were selected for publication in the journal.
: All the authors declare that they have no conflicts of interest with any of the organizations that sponsored the research.