Yang, Zhao-xia https://orcid.org/0000-0001-7722-8327
Hu, Xin-Xing
Grimm, Robert
Fu, Cai-xia
Yan, Xu
Zeng, Meng-su
Rao, Sheng-Xiang
Article History
Received: 12 August 2018
Revised: 1 February 2019
Accepted: 10 March 2019
First Online: 20 March 2019
Compliance with ethical standards
:
: The authors declare they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The Institutional Review Board of our hospital approved the retrospective study. For this retrospective study, formal consent is waved, and there is no requirement.