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Authors
Liu, Yusheng
Qiao, Lingyan
Hao, Xiwei
Lu, Hongting
Duan, Yuhe
Dong, Qian https://orcid.org/0000-0002-1289-529X
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Article History
Received: 16 January 2020
Accepted: 8 May 2020
First Online: 18 May 2020
Compliance with ethical standards
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: The authors declare that they have no conflict of interest.
: Ethical approval was waived by the Ethics Committee of The Affiliated Hospital of Qingdao University in view of the retrospective nature of the study and all the procedures performed being part of the routine care.
