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Authors
Ding, Xiao Song
Wu, Shan Shan
Chen, Hui
Zhao, Xue Qiao
Li, Hong Wei https://orcid.org/0000-0001-5900-7088
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (No. 81670315)
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Article History
Received: 13 March 2019
Accepted: 24 June 2019
First Online: 4 July 2019
Ethics approval and consent to participate
: Ethical approval was obtained from Beijing Friendship Hospital ethics committee (certification number: 2018-P2–051-01). This retrospective study was conducted without informed consent for some objective reasons and was approved by the ethics committee. All study procedures were performed in accordance with Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.
