Funding for this research was provided by:
Capital Characteristic Key Project of Beijing Municipal Science and Technology Commission (Z161100000516006)
Text and Data Mining valid from 2020-03-04
Received: 3 November 2019
Accepted: 25 February 2020
First Online: 4 March 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Scientific Research Ethics Committee of Capital Medical University affiliated Beijing Shijitan Hospital and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The written consent was obtained from the Ethics Committee. Informed consent was obtained from all individual participants included in the study.
: Not applicable.
: The authors declare that they have no competing interests.