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Authors
Song, Jiahui
Liang, Zhuo
Wang, Yunlong
Han, Zhihong
Ren, Xuejun
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Article History
Received: 12 January 2019
Revised: 21 November 2019
Accepted: 20 January 2020
First Online: 2 March 2020
Compliance with ethical guidelines
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: J. Song, Z. Liang, Y. Wang, Z. Han, and X. Ren declare that they have no competing interests.
: For this article no studies with human participants or animals were performed by any of the authors. All studies performed were in accordance with the ethical standards indicated in each case. This retrospective study was performed after consultation with the institutional ethics committee and in accordance with national legal requirements.
