Funding for this research was provided by:
Natural Science Foundation of Anhui Province (KJ2018A0208)
Received: 12 April 2020
Accepted: 17 November 2020
First Online: 26 November 2020
Ethics approval and consent to participate
: The study protocol was approved by the Medical Ethics and Human Clinical Trial Committee of The First Affiliated Hospital of Anhui Medical University. Given that this study was a retrospective study and all data were collected retrospectively from electronic medical records, informed consent is waived. But we did guarantee the opportunity by opt-out. Obtaining consent in this way was approved by the ethics committee of The First Affiliated Hospital of Anhui Medical University. All procedures performed in studies involving human participants were in accordance with the ethical standards of the national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Administrative permissions were acquired by our team to access the data used in this research.
: Not applicable.
: The authors declare that they have no competing interests.