Zhang, Jianyuan
Zhao, Xinming http://orcid.org/0000-0002-7060-2643
Zhao, Yan
Zhang, Jingmian
Zhang, Zhaoqi
Wang, Jianfang
Wang, Yingchen
Dai, Meng
Han, Jingya
Article History
Received: 29 July 2019
Accepted: 22 October 2019
First Online: 14 November 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in the study and involving human participants were carried out in accordance with the ethical standards of the institutional and/or national research committee and with the principles of the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: This retrospective analysis was approved by the Institutional Review Board of the Fourth Hospital of Hebei Medical University (Approval No. 2019MEC031), and the requirement of informed consent was waived.