Chen, R.
Tang, S.
Lu, Q.
Zhang, X.
Zhang, W.
Chen, Z.
Qi, S.
Article History
Received: 14 February 2019
Accepted: 3 November 2019
First Online: 31 December 2019
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: 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.
: This article is a retrospective study on human, and does not involve animal. We followed compliance with ethical standards during the study.
: For this type of article, informed consent is not required.