Funding for this research was provided by:
National Natural Science Foundation of China (91739111)
Received: 29 August 2019
Accepted: 28 January 2020
First Online: 3 February 2020
Ethics approval and consent to participate
: The study was performed in accordance with the ethical principles of the Declaration of Helsinki and approved by Capital Medical University affiliated Beijing Anzhen Hospital Ethics Committee (approval number: 2018054X). Participants gave their informed consent orally to be enrolled in the study. As this study is a retrospective study, we explained to patients that the patient’s clinical data have the potential to be used in future clinical studies with the support of the ethics committee, and the data used in this study was anonymised before its use.
: Not applicable.
: The authors declare that they have no competing interests.