Funding for this research was provided by:
Capital Foundation of Medical Development (201614035)
CAMS Major Collaborative Innovation Project (2016-I2M-1-011)
Text and Data Mining valid from 2020-03-19
Received: 1 February 2020
Accepted: 9 March 2020
First Online: 19 March 2020
Ethics approval and consent to participate
: The study complied with the principles of the Declaration of Helsinki and was approved by the ethical review board of Fuwai Hospital (Beijing, China). Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.