Zhang, Ying
Zhang, Shiqian http://orcid.org/0000-0002-6075-8433
Huang, Wenqian
Chen, Tingting
Yuan, Hang
Zhang, Yumin
Article History
Received: 26 May 2018
Accepted: 22 December 2018
First Online: 4 January 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional committee and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors.
: Because of the retrospective study based on anonymous patient records, informed consent was not required.