Xie, Wei
Hu, Shimin
Xu, Jie
Chen, Zhining
Medeiros, L. Jeffrey
Tang, Guilin http://orcid.org/0000-0002-9482-4806
Article History
Received: 23 January 2019
Accepted: 4 February 2019
First Online: 13 February 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This is a retrospective study and all procedures performed in the study 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.
: Informed consent was obtained from all participants included in the study.