Funding for this research was provided by:
National Natural Science Foundation of China (81362138)
Article History
Received: 18 December 2019
Accepted: 12 June 2020
First Online: 26 June 2020
Ethics approval and consent to participate
: All procedures performed were in accordance with the ethical standards of the Central Hospital of Enshi Autonomous Prefecture, Enshi, Hubei, China and the 1964 Helsinki declaration and its later amendments or comparable ethical standards. All the patients were informed of the purpose and procedures of the study and provided informed consent in written format prior to the start of the study.
: Not applicable.
: The authors declare that they have no competing interests.