Acknowledgements
This work was supported by grants
from
the
Natural Science Foundation of China
(Grant 81702615/H1622).
Conflict of interest The authors have no conflict of interest
to disclose.
Ethical Statement All procedures performed in this study
involving human participants were in accordance with the ethical
standards of the institutional and/or national research committee and
with the 1964 Helsinki declaration and its later amendments or
comparable ethical standards. Permission was gained from the local
ethics committee of Sun Yat-sen Memorial Hospital for this retrospective
analysis. For this type of study, formal consent was not required. All
data were recorded and analysed anonymously.