Funding for this research was provided by:
Capital Health Development Fund (201614035)
Text and Data Mining valid from 2019-10-14
Received: 18 August 2019
Accepted: 23 September 2019
First Online: 14 October 2019
Ethics approval and consent to participate
: Our study complied with the Declaration of Helsinki and was approved by the hospital’s ethical review board (Fu Wai Hospital and National Center for Cardiovascular Diseases, Beijing, China). Informed written consents were obtained from all patients enrolled in this study.
: Not applicable.
: The authors declare that they have no competing interests.