Liu, Tongtong
Ge, Xifeng
Yu, Jinhua
Guo, Yi
Wang, Yuanyuan
Wang, Wenping
Cui, Ligang
Funding for this research was provided by:
National Natural Science Foundation of China (61471125)
Article History
Received: 10 January 2018
Accepted: 17 May 2018
First Online: 21 June 2018
Compliance with ethical standards
:
: We have no conflict of interest to declare.
: 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. For retrospective study, formal consent is not required. Informed consent was obtained from all individual participants included in the study. This study has been approved by the ethics committee of the Peking University Third Hospital.