Funding for this research was provided by:
National Natural Science Foundation of China (81772703)
the Fund for Fostering Young Scholars of Peking University Health Science Center (BMU2017PY009)
The Beijing Natural Science Foundation (L182004)
Text and Data Mining valid from 2020-02-04
Received: 25 April 2019
Accepted: 20 January 2020
First Online: 4 February 2020
Ethics approval and consent to participate
: This study was approved by the Biomedical Research Ethics Committee of Peking University First Hospital, and written informed consent was obtained before any operation performed on patients.
: The authors confirm that we obtained written consent from the patients to publish this manuscript.
: The authors declare that they have no competing interests.