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Authors
Cui, Na
Mi, Song
Jiang, Chunguo
Sun, Wanlu
Mao, Wenping
Zhang, Liming
Feng, Xiaokai
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Article History
Received: 14 December 2020
Accepted: 3 August 2021
First Online: 14 August 2021
Declarations
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: This retrospective study involving human participants was approved by the ethics committee of the Beijing Chao-Yang Hospital, Capital Medical University (2020-ke-429) and was in accordance with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards which. Informed consent was exempted by the ethics committee of the Beijing Chao-Yang Hospital, Capital Medical University.
: Not applicable.
: The authors declare that they have no competing interests.
