Chen, Suyun
He, Kejun
Feng, Fang
Wang, Shaoyan
Yin, Yafu
Fu, Hongliang
Wang, Hui
Article History
Received: 29 January 2019
Accepted: 25 March 2019
First Online: 11 June 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This retrospective study was approved by the Institutional Review Board (Ethics Committee of Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, XHEC-D-2019-012, 2019). All procedures performed in this study involving human participants were in accordance with the ethical standards of the institution and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: For this type of study, the requirement for informed consent is waived.