Funding for this research was provided by:
Natural Science Foundation of Jiangsu Province (BK20151589)
Received: 23 May 2020
Accepted: 15 December 2020
First Online: 5 January 2021
Ethics approval and consent to participate
: This study was conducted in accordance with the amended Declaration of Helsinki. The approval of the Ethical Committee of Nanjing Medical University was obtained (project approval no. 2012-SRFA-161). The written informed consent from either the patients or their representatives was waived due to the retrospective nature of this study in accordance with the American Medical Association.
: Not applicable.
: The authors declare that they have no competing interests.