Funding for this research was provided by:
Natural Science Foundation of Hebei Province (H2020406049)
Initial Scientific Research Fund for High-Level Talents of Chengde Medical University (201901, 201809)
Scientific and Technological Research Projects of Hebei Higher Education (ZD2019084)
Medical Science Research Foundation of Health Commission of Hebei Province (20190857)
Received: 8 August 2020
Accepted: 20 October 2020
First Online: 27 October 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the Third Affiliated Hospital of Sun Yat-Sen University. Written informed consent to participate in this study was provided by the participants or the participants’ legal guardian.
: Not applicable.
: The authors declare that they have no competing interests.