Funding for this research was provided by:
Chinese Academy of Medical Sciences Innovation Fund for Medical Sciences (2016-I2M-1-009)
Text and Data Mining valid from 2019-10-19
Received: 28 August 2019
Accepted: 11 October 2019
First Online: 19 October 2019
Ethics approval and consent to participate
: This study was performed in accordance with the Declaration of Helsinki and was approved by the ethics committee of Fuwai Hospital. All patients provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.