Li, Ruoshi
Wang, Xia
Wei, Yahui
Fang, Yuan
Tian, Tian
Li, Mei
Cai, Yu
Pan, Yingzi
Article History
Received: 8 August 2019
Revised: 23 November 2019
Accepted: 27 November 2019
First Online: 10 December 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in this study involving human participants were in accordance with the ethical standards of the Institutional Review Board (IRB) of Peking University First Hospital and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. As a retrospective study, informed consent was not required.