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Authors
Liu, Chunhui
Fan, Xingyu
Guo, Zhizhi
Mo, Zhongjun
Chang, Eric I-Chao
Xu, Yan
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Article History
Received: 3 August 2018
Accepted: 3 December 2019
First Online: 18 December 2019
Ethics approval and consent to participate
: The biological and medical ethics committee of Beihang University granted approval for the study. Written informed consent was granted by the participants for the use of the images.
: Not applicable.
: The authors declare that they have no competing interests.
