Funding for this research was provided by:
Natural Science Foundation of Beijing Municipality (L182004)
the Fund for Fostering Young Scholars of Peking University Health Science Center (BMU2017PY009)
Text and Data Mining valid from 2020-02-03
Received: 31 March 2019
Accepted: 23 January 2020
First Online: 3 February 2020
Ethics approval and consent to participate
: The study received the ethics approval by committee of Peking University First Hospital. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. All patients agreed and signed the informed consent, that their information (including clinical information and surveillance) would be collected for scientific study and by published in professional medical journals.
: Not applicable.
: The authors declare that they have no competing interests.