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Authors
Cheng, Gang
Zhang, Jianning https://orcid.org/0000-0002-9261-9382
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Funding
Funding for this research was provided by:
National Natural Science Foundation (81572899)
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Article History
Received: 28 January 2018
Accepted: 29 November 2018
First Online: 22 December 2018
Compliance with ethical standards
: <b>Disclosure of potential conflicts of interest</b>
: The authors declare that they have no conflict of interest.
: The study was approved by the Ethic Committee of the hospital. This article does not contain any studies with animals performed by any of the authors
: The need for individual consent was waived by the committee because of the retrospective nature of the study.
